Idleness is the parent of psychology.

The philosopher believes that the value of his philosophy lies in the whole, in the building: posterity discovers it in the bricks with which he built and which are then often used again for better building: in the fact, that is to say, that building can be destroyed and nonetheless possess value as material.

The more you let yourself go, the less others let you go.

Christianity in particular should be dubbed a great treasure-chamber of ingenious consolations, such a store of refreshing, soothing, deadening drugs has it accumulated within itself.

A few hours of mountain climbing make a blackguard and a saint two rather similar creatures.

Madness is the result not of uncertainty but certainty.

I too have been in the underworld, as was Odysseus, and I will often be there again; not only sheep have I sacrificed so as to beable to speak with a few dead souls, but neither have I spared my own blood as well.