Philosophy Classics: The Islamic Golden Age

Thesis: An ideal political community is like an organism — only when the whole, led by a virtuous ruler who unites wisdom and revelation, moves toward one and the same "highest good" (saʿāda, true happiness) is the city healthy.

Al-Fārābī inherited Plato and Aristotle and was honored as the "Second Teacher" (al-Muʿallim al-Thānī) after Aristotle. His problem: how to place the Greek "philosopher-king" into a world that has prophets and revelation? His answer — the supreme ruler is the philosopher-prophet in one: grasping truth by reason, and translating it to the masses through imagination (revelation).

Al-Fārābī's view of the city as "an organic system whose parts cooperate toward one end" genuinely echoes "goal alignment" in multi-agent systems: a system's health depends not on how strong a single part is, but on whether the whole collaborates toward one objective function. A strong but misaligned part tears the whole apart.

Thesis: Essence (māhiyya) and existence (wujūd) are sharply distinct — all things are "possible existents" whose existence must be conferred by another; only the "Necessary Existent" (wājib al-wujūd, i.e. God) has existence as its very essence. And the soul can affirm itself directly once stripped of all body and sense: self-awareness is most primordial, and does not depend on the body.

Avicenna fused Aristotle and Neoplatonism, having the universe emanate from the "Necessary Existent" through a series of "intellects," and built the most systematic metaphysics of the Middle Ages; his essence/existence distinction deeply shaped Aquinas. The "Floating Man," meanwhile, aims to prove that the soul is immaterial and its self-awareness needs no bodily mediation. It was precisely this grand system that drew al-Ghazālī's frontal assault.

The "Floating Man" predates Descartes' cogito by about six hundred years and points straight at the core puzzle of modern consciousness science: does self-awareness (the minimal self) require a body? Avicenna holds that the pure "I am" is self-evident once stripped of all sensory content — a classical version of the claim that phenomenal "subjectivity" cannot be reduced to external mechanism, resonating with Nagel's "what is it like to be a bat."

Thesis: So-called "causal necessity" is merely habitual association, not logical necessity — cotton's burning is not "made so" by fire, but is the result God directly creates at each moment (occasionalism); to demote God's free will to mechanical necessity is overreach.

Al-Ghazālī is among the most influential Sunni theologians. He first mastered the philosophy of al-Fārābī and Avicenna, then dismantled it from within, point by point, in twenty discussions, judging three of them "unbelief" (the eternity of the world; that God knows only universals, not particulars; the denial of bodily resurrection). After the Incoherence, pure philosophical speculation in the eastern Islamic world greatly declined; the West's Ibn Rushd (Averroes) later answered with The Incoherence of the Incoherence.

Al-Ghazālī's denial of causal necessity predates Hume's "causation is just constant conjunction + mental habit" by about seven hundred years, with a strikingly identical structure: we only ever observe A always accompanying B, never "necessity" itself. This is the ancient source of the modern problem of induction and probabilistic causation (Bayesian): causation is an inference we project, not a reality directly perceived.

Thesis: The rise and fall of civilizations and dynasties follow observable laws, driven by "ʿaṣabiyya" (group solidarity): it gathers in hardship and dissolves in affluence, cycling roughly every three generations (a century or so). History can therefore become a science that investigates causes.

Ibn Khaldūn lived through the frequent turnover of North African dynasties. Dissatisfied with traditional historiography that records events without seeking causes, he proposed a "science of civilization" (ʿilm al-ʿumrān) — explaining history through economics, geography, and group psychology. This predates Comte's coining of "sociology" by nearly five hundred years, and he is widely regarded as the founder of sociology.

Ibn Khaldūn's cyclical dynamics are a direct forerunner of complexity science and "cliodynamics": today Peter Turchin uses mathematical models to capture rise-and-fall cycles driven by "elite overproduction + declining solidarity," whose core variable is the modern incarnation of ʿaṣabiyya — civilization seen as a complex adaptive system with internal dynamics, not a heap of contingent events.