Thesis The al-Ghazali–Hume parallel is shallower than the textbooks suggest
Where it stands
I teach comparative philosophy, and the sentence I most often have to correct in student essays is "al-Ghazālī anticipated Hume". I'd like to argue that the parallel, though real, is shallower than it is usually made to look.
The shared step is this: we observe one event accompanying another, never a necessity that links them. Beyond that the two diverge on at least three points.
- The question. Hume asks where our idea of necessary connection comes from, and answers that it comes from a feeling of expectation produced by custom. His problem is about the origin of an idea. Al-Ghazālī asks whether the philosophers can demonstrate that the effect necessarily follows from the cause, and argues that they cannot, because the cause without the effect involves no contradiction.
- The conclusion about necessity. Al-Ghazālī does not deny that there is a necessity governing events. He locates it in God's will. Hume denies that we have any idea of necessity beyond the felt expectation.
- The purpose. One makes room for divine agency and miracles. The other makes our confidence in causation a habit of mind with no rational foundation.
Calling al-Ghazālī a forerunner of Hume makes him a stage on the road to European empiricism, which is a strange compliment to pay a man who would have thought Hume's conclusion a disaster. My thesis: the arguments share a step, and the philosophies share almost nothing.