This paper discusses in critical terms Muhammad ‘Abd al-Jabiri’s influential philosophical work. It engages, in particular, in the analysis of the assumptions underlying the radical contrast that al-Jabiri sets up between Avicenna’s philosophy – which is supposed to represent irrationality and Gnosticism – and that of Averroes who, according to him, breaks decisively with that current of thought and thus makes exercising philosophical thought once again possible. After a close discussion of the positions of classical philosophers , the author concludes (...) that it is the very validity of the notion of “Arab reason” that has to be questioned in al-Jabiri’s analysis. (shrink)