Seyyed Hossein Nasr. Science and Civilization in Islam. New 
            
            American Library. NY 1968.  
          Introduction.
                      In the Name of God Most Merciful and Compassionate
          
     
          The Principles of Islam
            The history of science is often regarded today as the progressive accumulation of
techniques and the refinement of quantitative methods in the study of Nature. Such a point
of view considers the present conception of science to be the only valid one; it therefore
judges the sciences of other civilizations in the light of modern science and evaluates them
primarily with respect to their "development" with the passage of time. Our aim in this work,
however, is not to examine the Islamic sciences from the point of view of modern science
and of this "evolutionistic" conception of history; it is, on the contrary, to present certain
aspects of the Islamic sciences as seen from the Islamic point of view. 
             To the Muslim, history is a series of accidents that in no way affect the nontemporal
  
  principles of Islam. He is more interested in knowing and "realizing" these principles than
  
  in cultivating originality and change as intrinsic virtues. The symbol of Islamic civilization
  
  is not a flowing river, but the cube of the Kaaba, the stability of which symbolizes the
  
  permanent and immutable character of Islam.
 Once the spirit of the Islamic revelation had brought into being, out of the heritage of
  
  previous civilizations and through its own genius, the civilization whose manifestations
  
  may be called distinctly Islamic, the main interest turned away from change and
  
  "adaptation." The arts and sciences came to possess instead a stability and a
  
  "crystallization" based on the immutability of the principles from which they had issud forth;
  
  it is this stability that is too often mistaken in the West today for stagnation and
  
  sterility.
 The arts and sciences in Islam are based on the idea of unity, which is the heart of the
  
  Muslim revelation. Just as all genuine Islamic art, whether it be the Alhambra or the Paris
  
  Mosque, provides the plastic forms through which one can contemplate the Divine Unity
  
  manifesting itself in multiplicity, so do all the sciences that can properly be called Islamic
  
  reveal the unity of Nature. One might say that the aim of all the Islamic sciences and, more
  
  generally speaking, of all the medieval and ancient cosmological sciences is to show the
  
  unity and interrelatedness of all that exists, so that, in contemplating the unity of the
  
  cosmos, man may be led to the unity of the Divine Principle, of which the unity of Nature
  
  is the image.
 To understand the Islamic sciences in their essence, therefore, requires an understanding
  
  of some of the principles of Islam itself, even though these ideas may be difficult to express
  
  in modern terms and strange to readers accustomed to another way of thinking. Yet a
  
  statement of these principles is necessary here, insofar as they form the matrix within
  
  which the Islamic sciences have meaning, and outside of which any study of them would
  
  remain superficial and incomplete.
 Islamic civilization as a whole is, like other traditional civilizations, based upon a point of
  
  view: the revelation brought by the Prophet Muhammad is the "pure" and simple religion
  
  of Adam and Abraham, the restoration of a primordial and fundamental unity. The very
  
  word islam means both "submission" and "peace"or "being at one with the Divine Will."
 The creed of Islam "there is no divinity other than God and Muhammad is his prophet"
  
  summarizes in its simplicity the basic attitude and spirit of Islam. To grasp the essence of
  
  Islam, it is enough to recognize that God is one, and that the Prophet, who is the vehicle
  
  of revelation and the symbol of all creation, was sent by him. This simplicity of the Islamic
  
  revelation further implies a type of religious structure different in many ways from that of
  
  Christianity. There is no priesthood as such in Islam. Each Muslim being a "priest" is
  
  himself capable of fulfilling all the religious functions of his family and, if necessary, of his
  
  community; and the role of the imam, as understood in either Sunni or Shia Islam, does
  
  not in any way diminish the sacerdotal function of each believer. The orthodoxy based on
  
  this creed is intangible, and therefore not so closely bound to specific formulations of
  
  dogmatic theology as in Christianity. There have been, to be sure, sectional fanaticism and
  
  even persecution, carried on either by rulers or by exoteric theologians, against such
  
  figures as al Hallaj and Suhrawardl. Yet the larger orthodoxy, based on the essential
  
  doctrine of unity, has always prevailed and has been able to absorb within the structure
  
  of Islam all that is not contradictory to the Muslim creed.
 In its universal sense, Islam may be said to have three levels of meaning. All beings in the
  
  universe, to begin with, are Muslim, i.e., "surrendered to the Divine Will." (A flower cannot
  
  help being a flower; a diamond cannot do other than sparkle. God has made them so; it
  
  is theirs to obey.) Secondly, all men who accept with their will the sacred law of the
  
  revelation are Muslim in that they surrender their wdl to that law. When 'Uqbah, the Muslim
  
  conqueror of North Africa, took leave of his family and mounted his horse for the great
  
  adventure which was to lead him through two thousand miles of conquest to the Moroccan
  
  shores of the Atlantic, he cried out: "And now, God, take my soul." We can hardly imagine
  
  Alexander the Great having such thoughts as he set out eastward to Persia. Yet, as
  
  conquerors, the two men were to achieve comparable feats; the "passivity" of 'Uqbah with
  
  respect to the Divine Will was to be transmuted into irresistible action in this world.
 Finally, we have the level of pure knowledge and understanding. It is that of the
  
  contemplative, the gnostic ('arif), the level that has been recognized throughout Islamic
  
  history as the highest and most comprehensive. The gnostic is Muslim in that his whole
  
  being is surrendered to God; he has no separate individual existence of his own. He is like
  
  the birds and the flowers in his yielding to the Creator; like them, like all the other elements
  
  of the cosmos, he reflects the Divine Intellect to his own degree. He reflects it actively,
  
  however, they passively; his participation is a conscious one. Thus "knowledge" and
  
  "science" are defined as basically different frorn mere curiosity and even from analytical
  
  speculation. The gnostic is from this point of view "one with Nature"; he understands it
  
  "from the inside," he has become in fact the channel of grace for the universe. His islam
  
  and the islam of Nature are now counterparts.
 The intellective function, so defined, may be difficult for Westerners to grasp. Were it not
  
  for the fact that most of the great scientists and mathematicians of Islam operated within
  
  this matrix, it might seem so far removed as to be irrelevant to this study. Yet, it is closer
  
  in fact to the Western tradition than most modern readers are likely to realize. It is certainly
  
  very close to the contemplative strain of the Christian Middle Ages a strain once more
  
  evoked in part, during the modern era, by the German school of Naturphilosophie and by
  
  the Romantics, who strove for "communion" with Nature. Let us not be misled by words,
  
  however. The opening of the Romantic's soul to Nature even Keats's "negative capability"
  
  of receiving its imprint is far more a matter of sentiment (or, as they loved to call it then,
  
  "sensibility") than of true contemplation, for the truly contemplative attitude is based on
  
  "intellection."
 We should be mindful here of the changing usage of words. "Intellect" and "intellectual"
  
  are so closely identified today with the analytical functions of the mind that they hardly
  
  bear any longer any relation to the contemplative. The attitude these words imply toward
  
  Nature is the one that Goethe was to deplore as iate as the early nineteenth century that
  
  attitude that resolves, conquers, and dominates by force of concepts. It is, in short,
  
  essentially abstract, while contemplative knowledge is at bottom concrete. We shall thus
  
  have to say, by way of reestablishing the old distinction, that the gnostic's relation to
  
  Nature is "intellective," which is neither abstract, nor analytical, nor merely
  
  sentimental.
 Viewed as a text, Nature is a fabric of symbols, which must be read according to their
  
  meaning. The Quran is the counterpart of that text in human words; its verses are called
  
  ayat ("signs"), just as are the phenomena of Nature. Both Nature and the Quran speak
  
  forth the presence and the worsl~ of God: We shall show them Our portents on the horizon
  
  and within themselves until it will be manifest unto them that it is the Truth (41 53).
 To the doctors of the Law, this text is merely prescriptive, Nature being present in their
  
  minds only as the necessary setting for men's actions. To the gnostic or Sufi, on the other
  
  hand, the Quranic text is also symbolic, just as all of Nature is symbolic. If the tradition of
  
  the symbolic interpretation of the text of the Sacred Book were to disappear, and the text
  
  thereby reduced to its literal meaning, man might still know his duty, but the "cosmic text"
  
  would become unintelligible. The phenomena of Nature would lose any connection with
  
  the higher orders of reality, as well as among themselves; they would become mere "facts."
  
  This is precisely what the intellective capacity and, indeed, Islamic culture as a whole will
  
  not accept. The spirit of Islam emphasizes, by contrast, the unity of Nature, that unity that
  
  is the aim of the cosmological sciences, and that is adumbrated and prefigured in the
  
  continuous interlacing of arabesques uniting the profusion of plant life with the geometric
  
  crystals of the verses of the Quran.
 Thus we see that the idea of unity is not only the basic presupposition of the Islamic arts
  
  and sciences: it dominates their expression as well. The portrayal of any individual object
  
  would become a "graven image," a dangerous idol of the mind, the very canon of art in
  
  Islam is abstraction. Unity itself is alone deserving of representation; since it is not to be
  
  represented directly, however, it can only be symbolized and at that, only by hints. There
  
  is no concrete symbol to stand for unity, however; its true expression is negation, not this,
  
  not that. Hence, it remains abstract from the point of view of man, who lives in
  
  multiplicity.
 Thus we come to the central issue. Can our minds grasp the individual object as it stands
  
  by itself? or can we do so only by understanding the individual object within the context of
  
  the universe? In other words, from the cosmological point of view, is the universe the unity,
  
  and the individual event or object a sign (''phenomenon,'' "appearance") of ambiguous and
  
  uncertain import? Or is it the other way around? Of these alternatives, which go back to
  
  the time of Plato, the Muslim is bound to accept the first -- he gives priority to the universe
  
  as the one concrete reality, which symbolizes on the cosmic level the Divine Principle
  
  itself, although that cannot truly be envisaged in terms of anything else. This is, to be sure,
  
  an ancient choice, but Islam does inherit many of its theories from preexisting traditions,
  
  the truths of which it seeks to affirm rather than to deny. What it brings to them, as we have
  
  already said, is that strong unitary point of view that, along with a passionate dedication
  
  to the Divine Will, enabled Islam to rekindle the flame of science that had been
  
  extinguished at Athens and in Alexandria.
 We have seen that the sacred art of Islam is an abstract art, combining flexibility of line
  
  with emphasis on the archetype, and on the use of regular geometrical figures interlaced
  
  with one another. Herein one can already see why mathematics was to make such a strong
  
  appeal to the Muslim: its abstract  nature furnished the bridge that Muslims were seeking
  
  between multiplicity and unity. It provided a fitting texture of symbols for the universe
  
  -- symbols that were like keys to open the cosmic text.
 We should distinguish at once between the two types of mathematics practiced by
  
  Muslims: one was the scrence of algebra, which was always related to geometry and
  
  trigonometry; the other was the science of numbers, as understood in the Pythagorean
  
  sense. The Pythagorean number has a symbolic as well as a quantitative aspect; it is a
  
  projection of Unity, which, however, never leaves its source. Each number has an inherent
  
  power of analysis, arising out of its quantitative nature; it has also the power of synthesis
  
  because of the inner bond that connects all other numbers to the unit. The Pythagorean
  
  number thus has a "personality": it is like a Jacob's ladder, connecting the quantitative with
  
  the qualitative domain by virtue of its own inner polarization. To study numbers thus means
  
  to contemplate them as symbols and to be led thereby to the intelligible world. So also with
  
  the other branches of mathematics. Even where the symbolic aspect is not explicitly stated,
  
  the connection with geometric forms has the effect upon the mind of freeing it from
  
  dependence upon mere physical appearance, and in that way preparing it for lts iourney
  
  into the intelligible world and, ultimately, to Unity. 
 Gnosis in the Alexandrian world had used, as the vehicle for the expression of its
  
  doctrines, a bewildering maze of mythology. In Islam, the intellective symbolism often
  
  becomes mathematical, while the direct experience of the mystic is expressed in such
  
  powerful poetry as that of Jalal al-Din Rumi. The instrument of gnosis is always, however,
  
  the intellect; reason is its passive aspect and its reflection in the human domain. The link
  
  between intellect and reason is never broken, except in the individual ventures of a handful
  
  of thinkers, among whom there are few that could properly be called scientists. The
  
  intellect remains the principle of reason; and the exercise of reason, if it is healthy and
  
  normal should naturally lead to the intellect. That is why Muslim metaphysicians say that
  
  rational knowledge leads naturally to the affirmation of the Divine Unity. Although the
  
  spiritual realities are not merely rational, neither are they irrational Reason, considered in
  
  its ultimate rather than its immediate aspect, can bring man to the gateway of the
  
  intelligible worldrational knowledge can in the same fashion be integrated into gnosis,
  
  even though it is discursive and partial while gnosis is total and intuitive. It is because of
  
  this essential relationship of subordination and hierarchy between reason and intellect
  
  rational knowledge and gnosis, that the quest for causal explanation in Islam only rarely
  
  sought to, and never actually managed to, satisfy itself outside the faith, as was to happen
  
  in Christianity at the end of the Middle Ages.
 This hierarchy is also based on the belief that scientia -- human knowledge -- is to be
  
  regarded as legitimate and noble only so long as it is subordinated to sapientia -- Divine
  
  wisdom. Muslim sages would agree with Saint Bonaventure's "Believe, in order to
  
  understand." Like him, they insist that scientia can truly exist only in conjunction with
  
  sapientia, and that reason is a noble faculty only insofar as it leads to intellection, rather
  
  than when it seeks to establish its independence of its own principle, or tries to encompass
  
  the Infinite within some finite system. There are in Islamic history one or two instances
  
  when rationalist groups did attempt to establish their independence of and opposition to
  
  the gnostics, and also to set themselves against other orthodox interpreters of the Islamic
  
  revelation. The spiritual forces of Islam were always strong enough, however, to preserve
  
  the hierarchy between intellect and reason, and thus to prevent the establishment of a
  
  rationalism independent of the revelation. The famous treatises of al-Ghazzali, in the
  
  fifth/eleventh century, against the rationalistic philosophers of his time mark the final
  
  triumph of intellection overrindependent ratiocination a triumph that did not utterly destroy
  
  rationalistic philosophy, but did make it subordinate to gnosis. As a result of this defeat by
  
  al-Ghazzali and similar figures of the syllogistic and systematic Aristotelian philosophy in
  
  the fifth/eleventh century, the Islamic gnostic tradition has been able to survive and to
  
  remain vital down to the present day, instead of being stifled, as elsewhere, in an overly
  
  rationalistic atmosphere.
 The reaction against the rationalists, of which the wntings of al-Ghazzali mark the high
  
  point, coincides roughly in time with the spread of Aristotelianism in the West, which led
  
  ultimately to a series of actions and reactionsthe Renaissance, the Reformation, and the
  
  Counter-Reformationsuch as never occurred in the Islamic world. In the West, these
  
  movements led to new types of philosophy and science such as characterize the Western
  
  world today, that are as profoundly different from their medieval antecedents as is the
  
  mentaland spiritual horizon of modern man from that of traditional man. Europe in that
  
  period began to develop a science of Nature that concerns itself only with the quantitative
  
  and material aspects of things, meanwhile, the tide of Islamic thought was flowing back,
  
  as before, into its traditional bed, to that conceptual coherence that comprises the
  
  mathematical sciences.
 Today, as in the past, the traditional Muslim looks upon all of science as "sacred," and
  
  studies this sacred science in a well-established threefold articulation. First, within the
  
  reach of all, is the Law, contained in essence in the Quran, elucidated by tradition and
  
  jurisprudence, and taught by the doctors; it covers every aspect of the social and religious
  
  life of the believer. Beyond that lies the Path dealing with the inner aspect of things, which
  
  governs the spiritual life of those who have been "elected" to follow it. This has given rise
  
  to the various Sufi brotherhoods, since it is actually a way of life built upon communication
  
  at a personal, nonsystematic level. Finally, there is the ineffable Truth itself, which lies at
  
  the heart of both these approaches.
 According to a still-current simile, the Law is as the circumference of a circle, of which the
  
  Path is the radius, and the Truth the center. The Path and the Truth together form the
  
  esoteric aspect of Islam, to which Sufism is dedicated. At its core lies a metaphysical
  
  intuition, knowledge such as comes only to the right "mode in the knower." From this
  
  spring a science of the universe, a science of the soul, and the science of mathematics,
  
  each of them in essence a different metaphorical setting for that one science that the mind
  
  stnves after, each of them a part of that gnosis that comprehends all things.
 This may help explain why the mathematician, who was something of a displaced person
  
  in the West right up to the late Middle Ages, plays a central role in Islam from the very
  
  start. Two centuries after the establishment in the Near East of Christianity (in A.D. 313),
  
  the Christian-dominated West was still sunk deep in barbarism. Yet two centuries after
  
  Muhammad, the Islamic world under the Caliph Harun al Rashid was already far more
  
  active culturally than the contemporaneous world of Charlemagneeven with the latter's
  
  earlier start. What reached the West from Islam at that time was little more than dark tales
  
  of incredible wealth and wondrous magic. In Islam itself, however, the mathematician's
  
  craft, having "found its home," was already able to satisfy the civilized man's desire for
  
  logical subtlety and for intellectual games, while philosophy itself reached out into the
  
  mysteries beyond reason.
 This early stabilization of the theoretical outlook of Islam extended also to the type of man
  
  who embodied it. Whereas tke role of intellectual leadership in the West devolved upon
  
  several different figures in turnthe Benedictine monk, the scholastic doctor, the lay
  
  scientisttke central figure in Islamhas remained almost unchanging. He is the haklm, who
  
  encompasses within himself some or all of the several aspects of the sage; scholar,
  
  medical healer, spiritual guide. If he happens to be a wise merchant too, that also falls into
  
  the picture, for he is traditionally an itinerant person. If his achievements in mathematics
  
  are extraordinary, he may become a figure like 'Umar Khayyam. It is clear, moreover, that
  
  such a man be his name even Avicenna will never be able to develop each of his several
  
  attainments in the same fashion as the single-faceted specialist may. Such specialists do
  
  exist in Islam, but they remain mostly secondary figures. The sage does not let himself be
  
  drawn into the specialist's single-level "mode of knowing," for then he would forfeit the
  
  higher knowledge. Intellectual achievement is thus, in a sense, always patterned upon the
  
  model of the unattainable complete, that "total thing" that is not found in the Greek
  
  tradition. Ptolemy's Syntaxis becomes in the Muslim world the Almagest or Opus
  
  Maximumeven as Aristotle is purely and simply al-failasuf (the philosopher).
 The title of Avicenna's great treatise, Kitab al-Shifa, which rivals in scope the Aristotelian
  
  corpus, means The Book of Healing. As the title implies the work contains the knowledge
  
  needed to cure the soul of the disease of ignorance. It is all that is needed for man to
  
  understand; it is also as much as any man need know. Newton's work Principia has an
  
  obviously far different ring: it means a foundationessentially, a "beginning" rather than a
  
  knowledge that is complete and sufficient for man's intellectual needs as the titles of so
  
  many medieval Islamic texts imply. 
 
  
  Islam came into the world at the beginning of the seventh century A.D., its initial date (the
  
  journey of the Prophet from Mecca to Medina) being 622 A.D.; it had spread over all of   
  
  the Middle East, North Africa, and Spain, by the end of that same century. Just as the
  
  Islamic religion is one of the "middle way," so too did its territory come to occupyin fact, it
  
  still occupiesthe "middle belt" of the globe, from the Atlantic to the Pacific. In this region,
  
  the home of many earlier civilizations, Islam came into contact with a number of sciences
  
  which it absorbed, to the extent that these sciences were compatible with its own spirit and
  
  were able to provide nourishment for its own characteristic cultural life.
 The primordial character of its revelation, and its confidence that it was expressing the
  
  Truth at the heart of all revelations, permitted Islam to absorb ideas from many sources,
  
  historically alien yet inwardly related to it. This was especially true in regard to the
  
  sciences of Nature, because most of the ancient cosmological sciences -- Greek, as well
  
  as Chaldean, Persian, Indian, and Chinese -- had sought to express the unity of Nature
  
  and were therefore in conformity with the spirit of Islam. Coming into contact with them, the
  
  Muslims adopted some elements from eachmost extensively, perhaps, from the Greeks,
  
  but also from the Chaldeans, Indians, Persians, and perhaps, in the case of alchemy, even
  
  from the Chinese. They united these sciences into a new corpus, which was to grow over
  
  the centuries and become part of the Islamic civilization, integrated into the basic structure
  
  derived from the Revelation itself.
 The lands destined to become parts of the medieval Islamic world -- from Transoxiana to
  
  Andalusia -- were consolidated into a new spiritual universe within a single century after
  
  the death of the Prophet. The revelation contained in the Quran, and expressed in the
  
  sacred language (Arabic), provided the unifying pattern into which many foreign elements
  
  became integrated and absorbed, in accordance with the universal spirit of Islam. In the
  
  sciences, especially those dealing with Nature, the most important source was the heritage
  
  of Greek civilization.
 Alexandria, by the first century B.C., had become the center of Greek science and
  
  philosophy, as well as the meeting place of Hellenism with Oriental and ancient Egyptian
  
  influences, out of which came Hermeticism and Neoplatonism. The Greek heritage, itself
  
  to a great extent an assemblage of ancient Mediterranean views, systematized and put into
  
  dialectical form by the peculiar discursive power of the Greeks passed from Alexandria to
  
  Antioch, and from there to Nisibis and Edessa, by way of the Christian Monophysites and
  
  Nestorians. The latter were particularly instrumental in the spreading of Greek learning,
  
  chiefly in Syriac translation, to lands as far east as Persia.
 In the third century A.D., Shapur I founded Jundishapur at the site of an ancient city near
  
  the present Persian city of Ahwaz, as a prisoner-of-war camp, for soldiers captured in the
  
  war with Valerian. This camp gradually grew into a metropolis, which became a center of
  
  ancient sciences, studied in Greek and Sanskrit and later in Syriac.  A school was set up,
  
  on the model of those at Alexandria and Antioch, in which medicine, mathematics,
  
  astronomy, and logic were taught, mostly from Greek texts translated into Syriac, but also
  
  elements of the Indian and Persian sciences were included. This school, which lasted long
  
  after the establishment of the Abbasid caliphate, became an important source of ancient
  
  learning in the Islamic world.
 Aside from those more obvious avenues, there were also lines of communication with more
  
  esoteric aspects of the Greek sciences, particularly the Pythagorean school, through the
  
  community of Sabaeans of Harran. This religious community traced its origin to the
  
  Prophet Idns (the Enoch of the Old Testament), who is also regarded in the Islamic world
  
  as the founder of the sciences of the heavens and of philosophy, and who is identified by
  
  some with Hermes Trismegistus. The Sabaeans possessed a remarkable knowledge of
  
  astronomy, astrology, and mathematics; their doctrines were in many respects similar to
  
  those of the Pythagoreans. It was probably they who provided the link between the
  
  Hermetic Tradition and certain aspects of the Islamic esoteric doctrines, into which some
  
  elements of Hermeticism were integrated.
 On the Oriental side the Indian and, to a lesser degree, the Persian sciences came to have
  
  an important bearing upon the growth of the sciences in Islam, a bearing far greater than
  
  is usually recognized. In zoology, anthropology, and certain aspects of alchemy, as well
  
  as, of course, in mathematics and astronomy, the tradition of Indian and Persian sciences
  
  was dominant, as can be seen in the Epistles (Rasail) of the Brethren of Purity (Ikhwan
  
  al-Safa') and the translations of Ibn Muqaffa'. It must be remembered that the words
  
  "magic" and Magi are related, and that, according to the legend, the Jews learned alchemy
  
  and the science of numbers from the Magi, while in captivity in Babylon.
 There are most likely elements of Chinese science in Islam, especially in alchemy, pointing
  
  to some early contact between the Muslims and Chinese science. Some have even gone
  
  so far as to claimwithout much proof, to be sure -- that the word al-klmiya' from which
  
  "alchemy" is derived, is itself an arabization of the classical Chinese word Chin-l which in
  
  some dialects is Kim-Ia and means "the gold-making juice." The most important influence
  
  from China, however, was to come in later centuries, particularly after the Mongol invasion,
  
  and then primarily in the arts and technology.
 The totality of the arts and sciences in Islam thus consisted of a synthesis of the ancient
  
  sciences of the Mediterranean people, as incorporated and developed by the Greeks,
  
  along with certain Oriental elements. The dominant part of this heritage was definitely
  
  Graeco-Hellenistic, in translations either from Syriac or from the Greek itself, by such
  
  masters of translation as Hunain ibn Ishaq, and Thabit ibn Qurrah. There were numerous
  
  translations of Greek authors into Arabic in nearly every domain of knowledge. The ideas
  
  and points of views contained in these translations formed a large part of the nutriment
  
  which Islam sampled and then assimilated according to its own inner constitution, and the
  
  foundation given to it by tke Quranic revelation. In this way there developed, in conjunction
  
  with the three basic "dimensions" of the Law, the Path, and the Truth, Islamic schools
  
  which were to become an accepted part of Islamic civilization.
 With respect to Greek learning itself, Muslims came to distinguish between two different
  
  schools, each possessing a distinct type of science: one, the Hermetic-Pythagorean
  
  school, was metaphysical in its approach, its sciences of Nature depending upon the
  
  symbolic interpretation of phenomena and of mathematics; in the other, the
  
  syllogistic-rationalistic school of the followers of Aristotle, the point of view was
  
  philosophical rather than metaphysical, and its sciences were therefore aimed at finding
  
  the place of things in a rational system, rather than at seeing, through their appearances,
  
  their heavenly essences. The first school was regarded as the continuation, in Greek
  
  civilization, of the wisdom of the ancient prophets, especially Solomon and Idris; it was
  
  therefore considered to be based on divine rather than human knowledge The second
  
  school was looked upon, for the most part, as reflecting the best effort the human mind
  
  could make to arrive at the truth, an effort of necessity limited by the finite nature of human
  
  reason. The first school was to become an integral part of Islam, certain of its cosmological
  
  sciences being integrated into some of the branches of Sufism. The second school did
  
  have many disciples in the earlier centuries and thus left an influence upon the language
  
  of Muslim theology after the seventh/thirteenth century, it lost ground, however and,
  
  despite its continuation up to the present day, it has remained a secondary aspect of
  
  Islamic intellectual life.
 The various levels of reference existing hierarchically within the structure of Islam are
  
  presented concisely by a sage who lived in the fifth/eleventh century, and who is probably
  
  the one Oriental figure most familiar to the modern Western public: 'Umar Khayyam,
  
  mathematician and poet extraordinary. That he should be regarded in the Western world,
  
  on the strength of his famous quatrains as a skeptical hedonist is itself a sign of the
  
  profound lack of understanding between the two worlds; for he was in reality a sage and
  
  a gnostic of high standing. What appears to be lack of concern or agnosticism in his poetry
  
  is merely an accepted form of expression, within which he incorporated both the drastic
  
  remedy that the gnostic applies to religious hypocrisy, and also the reestablishment of
  
  contact with reality. (Late Greeks, such as Aenesidemus, had had recourse to the same
  
  skeptical device, and with similar intentions. ) In the following passage from a metaphysical
  
  treatise, Khayyam divides the seekers after knowledge into four categories:
 (1) The theologians, who become content with disputation .and "satisfying" proofs, and
  
  consider this much knowledge of the Creator (excellent is His Name) as sufflcient.
 (2) The philosophers and learned men [of Greek inspiration] who use rational arguments
  
  and seek to know the laws of logic, and are never content merely with "satisfying"
  
  arguments. But they too cannot remain faithful to the conditions of logic, and become
  
  helpless with it.
 (3) The Ismailis [a branch of Shia Islam] and others who say that the way of knowledge is
  
  none other than receiving information from a learned and credible informant; for, in
  
  reasoning about the knowledge of the Creator, His Essence and Attributes, there is much
  
  difficulty; the reasoning power of the opponents and the intelligent [of those who struggle
  
  against the final authority of the revelation, and of those who fully accept it] is stupefied
  
  and helpless before it. Therefore, they say, it is better to seek knowledge from the words
  
  of a sincere person.
 (4) The Sufis, who do not seek knowledge by meditation or discursive thinking, but by
  
  purgation of their inner being and the purifying of their dispositions. They cleanse the
  
  rational soul of the impurities of nature and bodily form, until it becomes pure substance.
  
  It then comes face to face with the spiritual world, so that the forms of that world become
  
  truly reflected in it, without doubt or ambiguity.
 This is the best of all ways, because none of the perfections of God are kept away from
  
  it, and there are no obstacles or veils put before it. Therefore, whatever [ignorance] comes
  
  to man is due to the impurity of his nature; if the veil be lifted and the screen and obstacle
  
  removed, the truth of things as they are will become manifest. And the Master [the Prophet
  
  Muhammad] --   upon whom be peace --  indicated this when he said: "Truly, during the
  
  days of your existence, inspirations come from God. Do you not want to follow them?"Tell
  
  unto reasoners that, for the lovers of God [gnostics] intuition is guide, not discursive
  
  thought.
 Here we have, stated authoritatively, the central perspective of Islamic thought, in which
  
  the component parts fall naturally into place. Each one is a different mode of knowing. It
  
  is puzzling at first sight to find nowhere in it the mathematicians, of whom Khayyam himself
  
  was such an eminent example. Notice, however, that the Ismailis correspond quite closely
  
  with what in the early Pythagorean school had been the Akusmatikoi, "those who go by
  
  what is told them." It should be noticed, also, that the Pythagorean Mathematikoi, the
  
  "expounders of the doctrine," will be found both among the philosophers and again among
  
  the Sufis, since systematic theory remains helpless without spiritual achievement, which
  
  is precisely what mathematics is intended to lead to, by contrast with syllogistic
  
  hair-splitting. This is clearly revealed in later sections of the same work in which Khayyam
  
  describes himself as both an orthodox Pythagorean and a Sufi. 
 Here, too, we see the significant contrast with the Greek world. For the Pythagorean
  
  doctrines alluded to had become practically extinct there by the time of Aristotle, and were
  
  to be taken up again, and at that only after a fashion, in the Hellenistic revival; in Islam,
  
  we see them stabilized and restored almost according to their original pattern through the
  
  unitary religious idea. Islam was thus able to hand on to the West, to the extent that the
  
  latter accepted the Pythagorean tradition, something more coherent, as well as technically
  
  more advanced, than the West's own immediate heritage from antiquity.
 There are other lines to be found in Khayyam's spectrum. The "atomistic" school of thought
  
  which flourished in Islam after the fourth/tenth century, and which in the Western
  
  pespective might be supposed to be scientific, he regards as not belonging to science at
  
  all, but to theology, for the Ash'arites who represented this school were exactly the sort of
  
  " theologians" he described. In the writings of the followers of this school, especially
  
  al-Baqillam, who may be considered their outstanding "philosopher of Nature, "the
  
  continuity of external forms is broken by an "atomistic" doctrine of time and space, and by
  
  the denial of the Aristotelian notion of causality. For the Ash'arites (as also for the Sufis),
  
  the world is annihilated and recreated at every moment; the cause of all events is the
  
  Creator and not a finite, created agent.  A stone falls because God makes it fall, not
  
  because of the nature of the stone or because it is impelled by an external force. Whatappears as "Laws of Nature," i.e., the uniformity of sequence of cause and effect, is only
  
  a matter of habit, determined by the will of God and given the status of "law" by Him.
  
  Miracles, which seem to break the apparent uniformity of natural phenomena, are simply
  
  going against the "habit" of Nature; the Arabic word for a supernatural event means
  
  literally that which results from "rupture of habit." We are facing here a strict
  
  "consequentiality," which has its parallel in Western thought of the seventeenth century.
  
  From Descartes to the Occasionalists, the development presents curious similarities.
 In the second grouping on Khayyam's list, the "philosophers and learned
  
  men," we would find assembled all the famous names of Islamic science. There is a sharp
  
  distinction, however, between two schools of "philosophical"     thought, both of which profess
  
  to be disciples of the Greeks. The first is the Peripatetic school, whose doctrines are a
  
  combination of the ideas of Aristotle and of some Neoplatonists. The representative of this
  
  school who was closest to Aristotle was Averroes who, paradoxically, had less effect upon
  
  the Islamic than upon the Christian world, and should be studied more as a great member
  
  of the tradition of Western philosophy than as an integral part of Islamic intellectual
  
  life.
 The science of Nature cultivated by the Peripatetic school is primarily
  
  syllogistic: it seeks to determine the place of each being, in a vast system based upon the
  
  philosophy of Aristotle. The best expression of the doctrines of this school appears in
  
  Avicenna's early writings. The Book of Healing is the most comprehensive encyclopedia
  
  of knowledge ever written by one person, and undoubtedly the most influential Peripatetic
  
  work in Islam.The other Islamic school professing to follow the Greeks was much more
  
  sympathetic to the Pythagorean-Platonic than to the Aristotelian tradition. This school,
  
  which in later centuries came to be called the Illuminatist (ishraqi) school, asserts that it
  
  derives its doctrines not only from the Pythagoreans and their followers, but from the
  
  ancient Prophets, the Hermetic Tradition, and even from the ancient Zoroastrian sages.
  
  The symbolic works of Avicenna, such as Living Son of the Awake (Hayy ibn Yaqzan) are
  
  early expressions of the writings of this school. The greatest Illuminatist philosopher,
  
  however, is Suhrawardi, who drew his symbolism from all the many sources mentioned
  
  above.The sciences of Nature, as well as the mathematics cultivated by certain adherents
  
  of this school, are primarily symbolic, and resemble to a great extent the writings of sorne
  
  Neoplatonists. Nature becomes for the writers of this school a cosmic crypt from whose
  
  confines they must seek to escapeand on their journey through it, they see in its
  
  phenomena "signs," which guide them on the road toward final "illumination." Many
  
  Illuminatists, particularly those of later centuries, have also been Sufis, who have made
  
  use of the eminently initiatic language of the Illuminatist philosophers to describe the
  
  journey of the Sufi toward gnosis. Many members of this school, and in general the learned
  
  men whom Khayyam mentions, have also been among the group that have cultivated
  
  mathematics, astronomy, and medicine; for these learned men took an interest in all the
  
  arts and sciences, and helped to keep alive the traditions of learning in those fields, as an
  
  integral part of their studies in philosophy.
 The Peripatetics were very strong during the fourth/tenth and fifth/eleventh centuries, but
  
  their influence weakened during the succeeding period. The Illuminatists, on the other
  
  hand, became strong after the sixth/twelfth century and al-Ghazzah's triumph. They have
  
  had a continuous tradition down to the present day, chiefly because of the metaphysical
  
  (as against rationalistic) emphasis in their doctrines, and also because of the use of their
  
  language by certain Sufi masters. One of the greatest exponents of Illuminatist doctrines,
  
  as interpreted and modified by the Safavid sage Mulla Sadra, was Hajil Mulla Hadi
  
  Sabziwari who died in Persia less than a century ago.
 The Ismailis, to whom Khayyam next refers, are a branch of Shia Islam, which was very
  
  powerful in his time, and also played a considerable role in the cultivation of the arts and
  
  sciences. Ismaili doctrines are fundamentally esoteric, being based on numerical
  
  symbolism and the symbolic interpretation of the "cosmic text." The symbolic interpretation
  
  of the Quran, which is basic in Shia Islam as well as in Sufism, was made the basis for the
  
  symbolic study of Nature. Moreover, such sciences as alchemy and astrology became
  
  integrated into their doctrines, and such texts as the Epistles of the Brethren of Purity, and
  
  the numerous writings of Jabir ibn Hayyan, the alchemist, were to have their greatest
  
  influence upon this group. The development of what has been called "Oriental
  
  neo-Pythagoreanism" is found most clearly in the treatises of the Ismailis. They were very
  
  much interested in the sciences of Nature; in integrating the rhythms and cycles of Nature
  
  with the cycles of history and with the manifestations of various prophets and imams, their
  
  works rank among the most important Islamic writings on Nature.
 Khayyam mentions, finally, the Sufis or gnostics, the group to which he himself belonged.
  
  It may seem surprising that a man so well versed in the arts and sciences of his day should
  
  consider the "way of purification" of the Sufis as the best way of acquiring knowledge. His
  
  language in this regard, however, is not merely theoretical, it is almost operational: one
  
  cleanses and focuses the instrument of perception, i.e., the soul, so that it may see the
  
  realities of the spiritual world. Aristotle himself, the great rationalist, had once said that
  
  "knowledge is according to the mode of the knower." The gnostic, in employing the "right"
  
  mode of knowledge ensures that Intellection takes place in him immediately and intuitively.
  
  In this regard, Khayyam's statement becomes clearer when seen in the light of a doctrine
  
  that we shall discuss later: the doctrine of the universal man, who is not only the final goal
  
  of the spiritual life, but also the archetype of the universe.
 To the extent that the gnostic is able to purify himself of his individualistic and particular
  
  nature, and thus to identify himself with the universal man within him, to that same extent
  
  does he also gain knowledge of the principles of the cosmos, as well as of the Divine
  
  realities. For the gnostic, knowledge of Nature is secondary to knowledge of the Divine
  
  Principle; yet, because of the rapport between the gnostic and the universe, Nature does
  
  play a positive role in guiding him to his ultimate goal. The phenomena of Nature become
  
  "transparent" for the gnostic, so that in each event he "sees" the archetype. The symbols
  
  of substances -- geometric forms and numerical quantities, colors, and directions -- these
  
  and many other such symbols are aspects of the being of things. They increase in their
  
  reality -- a reality independent of personal taste or of the individual -- to the extent that the
  
  gnostic divorces himself from his individual perspective and limited existence, and
  
  identifies himself with Being. For the gnostic, the knowledge of anything in the universe
  
  means ultimately knowledge of the relationship between the essence of that particular
  
  being and the Divine Intellect, and the knowledge of the ontological relationship between
  
  that being and Being itself.
 Kayyam's classification did not take into consideration certain writers of great importance,
  
  who did not follow any particular school. There are also many Islamic writers, hakims,
  
  including Khayyam himself, who possessed a knowledge of several disciplines, and in
  
  whom two or more levels of his hierarchy of knowledge may be found. Some of the most
  
  outstanding of these men will be discussed in the next chapter.
 smuch as the hierarchy of knowledge in Islam, as it has existed historically, has been
  
  united by a metaphysical bond much as a vertical axis unites horizontal planes of
  
  reference the integration of these diverse views "from above" has been possible.
  
  Historically, of course, there have been many conflicts, sometimes disputes leading to
  
  violence and occasionally to the death of a writer. Such conflicts are not, however, as
  
  elsewhere, between incompatible orthodoxies. They are regarded by most Islamic
  
  commentators as due to the lack of a more universal point of view on the part of those who
  
  have only embraced a less universal one. Only the gnostic, who sees all things "as they
  
  really are," is able to integrate all these views into their principial unity.
 Regarded from their own point of view, each of these schools may be said to possess a
  
  certain "philosophy of Nature, and, in conformity with it, to cultivate the sciences dealing
  
  with the universe. Some of their writings, primarily those of the Peripatetics, were to be
  
  translated into Latin to help form that Western scholasticism which was later to give way
  
  to seventeenth-century "natural philosophy." Other writings, such as those of the
  
  alchemists, were to flourish in the Western world for several centuries, only to wither away
  
  in its atmosphere of rationalistic philosophy. There were still other works, especially those
  
  of the Sufis and Illuminatists, which were to have an influence on certain Western circles
  
  such as that of Dante, and yet for the most part to remain almost unknown in the Western
  
  world, down to comparatively recent times.
 In this brief introduction, it has been necessary to cover much ground that is unfamiliar and
  
  often quite difficult for a Western reader to grasp. But we felt that we had to dispel the
  
  common conception of the Muslims as merely Puritan warriors and merchants, whose
  
  strange bent for the "subtleties" of algebra and logic somehow also enabled them to
  
  become the transmitters of Greek learning to the West. As against that all too current
  
  notion, we have tried to present a brief picture of a culture whose spiritual values are
  
  inextricably tied up with mathematics and with metaphysics of a high order, and which
  
  once again fused the constituent elements of Greek science into a powerful unitary
  
  conception, which had an essential influence on the Western world up to the time of the
  
  Renaissance.
 Strangely enough, it is this latter conception, half unknown at best, and then quickly
  
  forgotten in the Wcst, which has remained, up to the present Western impact upon the
  
  Islamic world, the major factor in the Islamic perspective determining its attitude toward
  
  Nature and the meaning it gives to the sciences of Nature; conversely, it is those very
  
  elements of the Islamic sciences, most responsible for providing the tools with which the
  
  West began the study of the already secularized Nature of the seventeenth century, that
  
  became secondary in the Islamic world itself and had already ceased to occupy the main
  
  intellectual efforts of that civilization by the ninth/ fifteenth century.
 The Western world has since concentrated its intellectual energies upon the study of the
  
  quantitative aspects of things, thus developing a science of Nature, whose all too obvious
  
  fruits in the physical domain have won for it the greatest esteem among people
  
  everywhere, for most of whom "science" is identified with technology and its applications.
  
  Islamic science, by contrast, seeks ultimately to attain such knowledge as will contribute
  
  toward the spiritual perfection and deliverance of anyone capable of studying it; thus its
  
  fruits are inward and hidden, its values more difficult to discern. To understand it requires
  
  placing oneself within its perspective and accepting as legitimate a science of Nature
  
  which has a different end, and uses different means, from those of modern science. If it is
  
  unjust to identify Western science solely with its material results, it is even more unjust to
  
  judge medieval science by its outward "usefulness" alone. However important its uses may
  
  have been in calendarial work, in irrigation, in architecture, its ultimate aim has always
  
  been to relate the corporeal world to its basic spiritual principle, through the knowledge of
  
  those symbols which unite the various orders of reality. It can only be understood, and
  
  should only be judged, in terms of its own aims and its own perspectives.