Al-Farabi in the context of "Early Islamic philosophy"

Aristotelianism (/ˌærɪstəˈtiːliənɪzəm/ ARR-i-stə-TEE-lee-ə-niz-əm) is a philosophical tradition inspired by the work of Aristotle, usually characterized by deductive logic and an analytic inductive method in the study of natural philosophy and metaphysics. It covers the treatment of the social sciences under a system of natural law. It answers why-questions by a scheme of four causes, including purpose or teleology, and emphasizes virtue ethics. Aristotle and his school wrote tractates on physics, biology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics, and government. Any school of thought that takes one of Aristotle's distinctive positions as its starting point can be considered "Aristotelian" in the widest sense. This means that different Aristotelian theories (e.g. in ethics or in ontology) may not have much in common as far as their actual content is concerned besides their shared reference to Aristotle.

In Aristotle's time, philosophy included natural philosophy, which preceded the advent of modern science during the Scientific Revolution. The works of Aristotle were initially defended by the members of the Peripatetic school and later on by the Neoplatonists, who produced many commentaries on Aristotle's writings. In the Islamic Golden Age, Avicenna and Averroes translated the works of Aristotle into Arabic and under them, along with philosophers such as Al-Kindi and Al-Farabi, Aristotelianism became a major part of early Islamic philosophy.

Ibn Rushd (14 April 1126 – 11 December 1198), Latinized as Averroes, was an Andalusian polymath and jurist who was proficient in a variety of intellectual fields, including philosophy, theology, medicine, astronomy, physics, psychology, mathematics, neurology, Islamic jurisprudence and law, and linguistics. The author of more than 100 books and treatises, his philosophical works include numerous commentaries on Aristotle, for which he was known in the Western world as "The Commentator" and "Father of Rationalism".

Averroes was a strong proponent of Aristotelianism; he attempted to restore what he considered the original teachings of Aristotle and opposed the Neoplatonist tendencies of earlier Muslim thinkers, such as al-Farabi and Avicenna. He also defended the pursuit of philosophy against criticism by Ash'ari theologians such as Al-Ghazali. Averroes argued that philosophy was permissible in Islam and even compulsory among certain elites. He also argued scriptural text should be interpreted allegorically if it appeared to contradict conclusions reached by reason and philosophy. In Islamic jurisprudence, he wrote the Bidāyat al-Mujtahid on the differences between Islamic schools of law and the principles that caused their differences. In medicine, he proposed a new theory of stroke, described the signs and symptoms of Parkinson's disease for the first time, and might have been the first to identify the retina as the part of the eye responsible for sensing light. His medical book Al-Kulliyat fi al-Tibb, translated into Latin and known as the Colliget, became a textbook in Europe for centuries.

The existence of God is a subject of debate in the philosophy of religion and theology. A wide variety of arguments for and against the existence of God (with the same or similar arguments also generally being used when talking about the existence of multiple deities) can be categorized as logical, empirical, metaphysical, subjective, or scientific. In philosophical terms, the question of the existence of God involves the disciplines of epistemology (the nature and scope of knowledge) and ontology (study of the nature of being or existence) and the theory of value (since some definitions of God include perfection).

The Western tradition of philosophical discussion of the existence of God began with Plato and Aristotle, who made arguments for the existence of a being responsible for fashioning the universe, referred to as the demiurge or the unmoved mover, that today would be categorized as cosmological arguments. Other arguments for the existence of God have been proposed by St. Anselm, who formulated the first ontological argument; Thomas Aquinas, who presented his own version of the cosmological argument (the first way); René Descartes, who said that the existence of a benevolent God is logically necessary for the evidence of the senses to be meaningful. John Calvin argued for a sensus divinitatis, which gives each human a knowledge of God's existence. Islamic philosophers who developed arguments for the existence of God comprise Averroes, who made arguments influenced by Aristotle's concept of the unmoved mover; Al-Ghazali and Al-Kindi, who presented the Kalam cosmological argument; Avicenna, who presented the Proof of the Truthful; and Al-Farabi, who made Neoplatonic arguments.

The natural sciences saw various advancements during the Golden Age of Islam (from roughly the mid 8th to the mid 13th centuries), adding a number of innovations to the Transmission of the Classics (such as Aristotle, Ptolemy, Euclid, Neoplatonism). During this period, Islamic theology was encouraging of thinkers to find knowledge. Thinkers from this period included Al-Farabi, Abu Bishr Matta, Ibn Sina, al-Hassan Ibn al-Haytham and Ibn Bajjah. These works and the important commentaries on them were the wellspring of science during the medieval period. They were translated into Arabic, the lingua franca of this period.

Islamic scholarship in the sciences had inherited Aristotelian physics from the Greeks and during the Islamic Golden Age developed it further. However the Islamic world had a greater respect for knowledge gained from empirical observation, and believed that the universe is governed by a single set of laws. Their use of empirical observation led to the formation of crude forms of the scientific method. The study of physics in the Islamic world started in Iraq and Egypt. Fields of physics studied in this period include optics, mechanics (including statics, dynamics, kinematics and motion), and astronomy.

Classical theism is a theological and philosophical form of theism that conceives of God as the ultimate reality, characterized by attributes such as omnibenevolence, omnipotence, and omniscience. Rooted in the ancient Greek philosophy of Plato and Aristotle, classical theism presents God as a deity that is immutable, impassible, transcendent, and entirely self-sufficient. This understanding of God emphasizes divine simplicity, where God's essence and existence are identical, making him fundamentally distinct from all created beings.

Throughout history, classical theism has significantly shaped the doctrines of major religious traditions, particularly within Judaism, Christianity, and Islam. In Jewish thought, philosophers like Philo and Maimonides emphasized the unity and transcendence of God, aligning closely with classical theistic principles. The early Church Fathers, like Irenaeus, Clement of Alexandria and Augustine incorporated classical theistic ideas into Christian theology, establishing a framework that was later to be refined by medieval thinkers such as Thomas Aquinas. Islamic philosophers such as Avicenna and Al-Farabi adopted classical theistic concepts to articulate a vision of God as utterly singular and beyond human comprehension.

Muslim philosophers both profess Islam and engage in a style of philosophy situated within the structure of the Arabic language and Islam, though not necessarily concerned with religious issues. The sayings of the companions of Muhammad contained little philosophical discussion. In the eighth century, extensive contact with the Byzantine Empire led to a drive to translate philosophical works of Ancient Greek Philosophy (especially the texts of Aristotle) into Arabic.

The ninth-century Al-Kindi is considered the founder of Islamic peripatetic philosophy (800 CE – 1200 CE). The tenth-century philosopher al-Farabi contributed significantly to the introduction of Greek and Roman philosophical works into Muslim philosophical discourse and established many of the themes that would occupy Islamic philosophy for the next centuries; in his broad-ranging work, his work on logic stands out particularly. In the eleventh century, Ibn Sina, one of the greatest Muslim philosophers ever, developed his own unique school of philosophy known as Avicennism which had strong Aristotelian and Neoplatonist roots. Al-Ghazali, a famous Muslim philosopher and theologian, took the approach to resolving apparent contradictions between reason and revelation. He understood the importance of philosophy and developed a complex response that rejected and condemned some of its teachings, while it also allowed him to accept and apply others. It was al-Ghazali's acceptance of demonstration (apodeixis) that led to a much more refined and precise discourse on epistemology and a flowering of Aristotelian logic and metaphysics in Muslim theological circles. Averroes, the last notable Muslim peripatetic philosopher, defended the use of Aristotelian philosophy against this charge; his extensive works include noteworthy commentaries on Aristotle. In the twelfth century, the philosophy of illumination was founded by Shahab al-Din Suhrawardi. Although philosophy in its traditional Aristotelian form fell out of favor in much of the Arab world after the twelfth century, forms of mystical philosophy became more prominent.

Medieval Islamic philosophy was steeped in both Aristotelianism and Neoplatonism from its ninth-century beginnings with al-Kindi, but the influence of Neoplatonism becomes more clearly visible in the tenth and eleventh centuries with Al-Farabi and Avicenna. Al-Farabi expanded on Plato's concept of an ideal city ruled by philosopher-kings to develop a political philosophy that could accommodate the religious and cultural diversity central to Islamic nations. On the other hand, both al-Ghazali and Ibn Rushd vigorously opposed Neoplatonic views.

The characteristic of Neoplatonic thought in Islamic theology is that of emanation, linking God's transcendence with the corporeal reality of his creation. Islamic Neoplatonism was introduced by Al-Farabi, although Avicenna proved to have the greater influence. Both authors present a complex scheme of emanation.

Early Islamic law placed importance on formulating standards of argument, which gave rise to a "novel approach to logic" (Arabic: منطق manṭiq "speech, eloquence") in Kalam (Islamic scholasticism).However, with the rise of the Mu'tazili philosophers, who highly valued Aristotle's Organon, this approach was displaced by the older ideas from Hellenistic philosophy. The works of al-Farabi, Avicenna, al-Ghazali and other Muslim logicians who often criticized and corrected Aristotelian logic and introduced their own forms of logic, also played a central role in the subsequent development of European logic during the Renaissance. Scholars who have studied Islamic logic include Nicholas Rescher, who in a 1964 work contextualized some 170 Arabic-language logicians, without the book being exhaustive. There have been hundreds of original treatises in the subject as well thousands of later commentaries or supra-commentaries.

According to the Routledge Encyclopedia of Philosophy: