| Avicenna |
|---|
| Avicennism |
| The Canon of Medicine |
| The Book of Healing |
| Hayy ibn Yaqdhan |
| Criticism of Avicennian philosophy |
| Unani medicine |
The Incoherence of the Philosophers (تهافت الفلاسفة Tahāfut al-Falāsifaʰ in Arabic) is the title of a landmark 11th century polemic by the Sufi sympathetic Imam Al-Ghazali (Algazel) of the Asharite school of Islamic theology criticizing the Avicennian school of early Islamic philosophy.[1] Muslim philosophers such as Ibn Sina (Avicenna) and Al-Farabi (Alpharabius) are denounced in this book. The text was dramatically successful, and marked a milestone in the ascendance of the Asharite school within Islamic philosophy and theological discourse.
Contents |
This book was preceded by a summary of Muslim philosophical thought titled: Aims of the philosophers Maqasid al-falasifah. This book is the summary of Avicenna's philosophical doctrine.[1] Al-Ghazali stated that one must be well versed in the ideas of the philosophers before setting out to refute their ideas.
Al-Ghazali also stated that he did not find other branches of philosophy including physics, logic, astronomy or mathematics problematic. His only dispute was with metaphysics, in which he claimed that the philosophers did not use the same tools, namely logic, which they used for other sciences.
The tahafut is organized into twenty chapters in which al-Ghazali attempts to refute Avicenna's doctrines.[1]
He states that Avicenna and his followers have erred in seventeen points (each one of which he addresses in detail in a chapter, for a total of 17 chapters) by committing heresy. But in three other chapters, he accuses them of being utterly irreligious. Among the charges that he leveled against the philosophers is their inability to prove the existence of God and inability to prove the impossibility of the existence of two gods.
The twenty points are as follows:
The three irreligious ideas are as follows:
The late 11th century book brings out contradictions in the thoughts of philosophers about God and the universe, favoring faith instead. In some ways, it can be seen as a precursor to Søren Kierkegaard's Either/Or or Immanuel Kant's Critique of Pure Reason, where some even describe it as a "more incisive and decisive critique of metaphysics than that of Kant."[2]
The Incoherence of the Philosophers is famous for proposing and defending the Asharite theory of occasionalism. Al-Ghazali wrote that when fire and cotton are placed in contact, the cotton is burned directly by God rather than by the fire, a claim which he defended using logic.
He explained that because God is usually seen as rational, rather than arbitrary, his behaviour in normally causing events in the same sequence (i.e., what appears to us to be efficient causation) can be understood as a natural outworking of that principle of reason, which we then describe as the laws of nature. Properly speaking, however, these are not laws of nature but laws by which God chooses to govern his own behaviour (his autonomy, in the strict sense) - in other words, his rational will.
This is not, however, an essential element of an occasionalist account, and occasionalism can include positions where God's behaviour (and thus that of the world) is viewed as ultimately inscrutable, thus maintaining God's essential transcendence. On this understanding, apparent anomalies such as miracles are not really such: they are simply God behaving in a way that appears unusual to us. Given his transcendent freedom, he is not bound even by his own nature. Miracles, as breaks in the rational structure of the universe, cannot occur, since God's relationship with the world is not mediated by rational principles.
Al-Ghazali expresses his support for a scientific methodology based on demonstration and mathematics, while discussing astronomy. After describing the scientific facts of the solar eclipse resulting from the Moon coming between the Sun and Earth and the lunar eclipse from the Earth coming between the Sun and Moon, he writes:[3]
Whosoever thinks that to engage in a disputation for refuting such a theory is a religious duty harms religion and weakens it. For these matters rest on demonstrations, geometrical and arithmetical, that leave no room for doubt.
In his defense of the Asharite doctrine of a created universe that is temporally finite, against the Aristotelian doctrine of an eternal universe, Al-Ghazali proposed the modal theory of possible worlds, arguing that their actual world is the best of all possible worlds from among all the alternate timelines and world histories that God could have possibly created. His theory parallels that of Duns Scotus in the 14th century. While it is uncertain whether Al-Ghazali had any influence on Scotus, they both may have derived their theory from their readings of Avicenna's Metaphysics.[4]
Ibn Rushd (Averroes) wrote a refutation of Al-Ghazali's work entitled The Incoherence of the Incoherence (Tahāfut al-Tahāfut) in which he defends the doctrines of the "philosophers" and criticizes al-Ghazali's own arguments. It is written as a sort of dialogue: Averroes quotes passages by al-Ghazali and then responds to them. This text was not as well received by the wider Islamic audience. In the 15th century, a refutation of Ibn Rushd’s arguments in Tahāfut al-Tahāfut was written by a Turkic scholar Mustafā Ibn Yūsuf al-Bursawī, also known as Khwājah Zādā (d. 1487), who defended al-Ghazali's views. This once again indicated to Islamic scholars the weakness of human understanding and the strength of faith.[5]
Another less critical response to Al-Ghazali's arguments was written by Ibn Rushd's predecessor Ibn Tufail (Abubacer) as part of his Arabic philosophical novel, Hayy ibn Yaqzan (later translated into Latin and English as Philosophus Autodidactus). Ibn Tufail cites al-Ghazali as an influence on his novel, especially his views on Sufism, but was critical of his views against Avicennism. Ibn al-Nafis later wrote another novel, Theologus Autodidactus, as a response to Ibn Tufail's Philosophus Autodidactus, defending some of al-Ghazali's views.
Al-Ghazali's insistence on a radical divine immanence in the natural world has been posited [6] as one of the reasons that the spirit of scientific inquiry later withered in Islamic lands. If "Allah's hand is not chained", then there was no point in discovering the alleged laws of nature. For example:
...our opponent claims that the agent of the burning is the fire exclusively;’ this is a natural, not a voluntary agent, and cannot abstain from what is in its nature when it is brought into contact with a receptive substratum. This we deny, saying: The agent of the burning is God, through His creating the black in the cotton and the disconnexion of its parts, and it is God who made the cotton burn and made it ashes either through the intermediation of angels or without intermediation. For fire is a dead body which has no action, and what is the proof that it is the agent? Indeed, the philosophers have no other proof than the observation of the occurrence of the burning, when there is contact with fire, but observation proves only a simultaneity, not a causation, and, in reality, there is no other cause but God.
The Ottoman sultan Mehmed II (a.k.a. el-Fatih) once commissioned two of the realm's scholars to write a book summarizing the ideas of the two great philosophers as to who won the debate across time.