The scope of this tradition was broad: it included the study of logic, the sciences of nature (including psychology and biology), the mathematical sciences (including music and astronomy), metaphysics, ethics, and politics. Each of these disciplines had a body of literature in which its principles and problems had been investigated by Classical authors, whose positions had been, in turn, stated, discussed, criticized, or developed by various commentators. Islamic philosophy emerged from its theological background when Muslim thinkers began to study this foreign tradition, became competent students of the ancient philosophers and scientists, criticized and developed their doctrines, clarified their relevance for the questions raised by the theologians, and showed what light they threw on the fundamental issues of revelation, prophecy, and the divine law. Relation to the Muʿtazilah and interpretation of theological issues The teachings of al-Kindī
Although the first Muslim philosopher, al-Kindī, who flourished in the first half of the 9th century, lived during the triumph of the Muʿtazilah of Baghdad and was connected with the ʿAbbāsid caliphs who championed the Muʿtazilah and patronized the Hellenistic sciences, there is no clear evidence that he belonged to a theological school. His writings show him to have been a diligent student of Greek and Hellenistic authors in philosophy and point to his familiarity with Indian arithmetic. His conscious, open, and unashamed acknowledgment of earlier contributions to scientific inquiry was foreign to the spirit, method, and purpose of the theologians of the time. His acquaintance with the writings of Plato and Aristotle was still incomplete and technically inadequate. He improved the Arabic translation of the Theology of Aristotle but made only a selective and circumspect use of it.
Devoting most of his writings to questions of natural philosophy and mathematics, al-Kindī was particularly concerned with the relation between corporeal things, which are changeable, in constant flux, infinite, and as such unknowable, on the one hand, and the permanent world of forms (spiritual or secondary substances), which are not subject to flux yet to which human beings have no access except through things of the senses. He insisted that a purely human knowledge of all things is possible, through the use of various scientific devices, learning such things as mathematics and logic, and assimilating the contributions of earlier thinkers. The existence of a “supernatural” way to this knowledge in which all these requirements can be dispensed with was acknowledged by al-Kindī: God may choose to impart it to his prophets by cleansing and illuminating their souls and by giving them his aid, right guidance, and inspiration; and they, in turn, communicate it to ordinary human beings in an admirably clear, concise, and comprehensible style. This is the prophets’ “divine” knowledge, characterized by a special mode of access and style of exposition. In principle, however, this very same knowledge is accessible to human beings without divine aid, even though “human” knowledge may lack the completeness and consummate logic of the prophets’ divine message.
Reflection on the two kinds of knowledge—the human knowledge bequeathed by the ancients and the revealed knowledge expressed in the Qurʾān—led al-Kindī to pose a number of themes that became central to Islamic philosophy: the rational–metaphorical exegesis of the Qurʾān and the Hadith; the identification of God with the first being and the first cause; creation as the giving of being and as a kind of causation distinct from natural causation and Neoplatonic emanation; and the immortality of the individual soul. The teachings of Abū Bakr al-Rāzī
The philosopher whose principal concerns, method, and opposition to authority were inspired by the extreme Muʿtazilah was the physician Abū Bakr al-Rāzī (flourished 9th–10th centuries). He adopted the Muʿtazilah’s atomism and was intent on developing a rationally defensible theory of creation that would not require any change in God or attribute to him responsibility for the imperfection and evil prevalent in the created world. To this end, he expounded the view that there are five eternal principles—God, Soul, prime matter, infinite, or absolute, space, and unlimited, or absolute, time—and explained creation as the result of the unexpected and sudden turn of events (faltah). Faltah occurred when Soul, in her ignorance, desired matter and the good God eased her misery by allowing her to satisfy her desire and to experience the suffering of the material world, and then gave her reason to make her realize her mistake and deliver her from her union with matter, the cause of her suffering and of all evil. Al-Rāzī claimed that he was a Platonist, that he disagreed with Aristotle, and that his views were those of the Ṣābians of Harran and the Brahmans (the Hindu priestly caste).
Ismāʿīlī theologians became aware of the kinship between certain elements of his cosmology and their own. They disputed with him during his lifetime and continued afterward to refute his doctrines in their writings. According to their account of his doctrines, he was totally opposed to authority in matters of knowledge, believed in the progress of the arts and sciences, and held that all reasonable human beings are equally able to look after their own affairs, equally inspired and able to know the truth of what earlier teachers had taught, and equally able to improve upon it. Ismāʿīlī theologians were incensed, in particular, by his wholesale rejection of prophecy, particular revelation, and divine laws. They were likewise opposed to his criticisms of religion in general as a device employed by evildoers and a kind of tyranny over human beings that exploits their innocence and credulity, perpetuates ignorance, and leads to conflicts and wars.
Although the fragmentary character of al-Kindī’s and al-Rāzī’s surviving philosophic writings does not permit passing firm and independent judgment on their accomplishments, they tend to bear out the view of later Muslim students of philosophy that both lacked competence in the logical foundation of philosophy, were knowledgeable in some of the natural sciences but not in metaphysics, and were unable to narrow the gap that separated philosophy from the new religion, Islam. The teachings of al-Fārābī Political philosophy and the study of religion
The first philosopher to meet this challenge was al-Fārābī (flourished 9th–10th centuries). He saw that theology and the juridical study of the law were derivative phenomena that function within a framework set by the prophet as lawgiver and founder of a human community. In this community, revelation defines the opinions the members of the community must hold and the actions they must perform if they are to attain the earthly happiness of this world and the supreme happiness of the other world. Philosophy could not understand this framework of religion as long as it concerned itself almost exclusively with its truth content and confined the study of practical science to individualistic ethics and personal salvation.
In contrast to al-Kindī and al-Rāzī, al-Fārābī recast philosophy in a new framework analogous to that of the Islamic religion. The sciences were organized within this philosophic framework so that logic, physics, mathematics, and metaphysics culminated in a political science whose subject matter is the investigation of happiness and how it can be realized in cities and nations. The central theme of this political science is the founder of a virtuous or excellent community. Included in this theme are views concerning the supreme rulers who follow the founder, their qualifications, and how the community must be ordered so that its members attain happiness as citizens rather than isolated human beings. Once this new philosophical framework was established, it became possible to conduct a philosophical investigation of all the elements that constituted the Islamic community: the prophet-lawgiver, the aims of the divine laws, the legislation of beliefs as well as actions, the role of the successors to the founding legislator, the grounds of the interpretation or reform of the law, the classification of human communities according to their doctrines in addition to their size, and the critique of “ignorant” (pagan), “transgressing,” “falsifying,” and “erring” communities. Philosophical cosmology, psychology, and politics were blended by al-Fārābī into a political theology whose aim was to clarify the foundations of the Islamic community and defend its reform in a direction that would promote scientific inquiry and encourage philosophers to play an active role in practical affairs. Interpretation of Plato and Aristotle