His writing can wander into the philosophical and religious territory but he is a brave writer that is prepared to tackle difficult and interesting questions. He is also a very honest writer using the editor's preface to confess to faults in his books and in the case of Fruits of the Earth to poor sales.
Here are the other Gide books I have read over the past few years:
Strait is the Gate
The Immoralist
Fruits of the Earth
