No power can be maintained when it is only represented by hypocrites.

Over immense periods of time the intellect produced nothing but errors. A few of these proved to be useful and helped to preserve the species: those who hit upon or inherited these had better luck in their struggle for themselves and their progeny. Such erroneous articles of faith... include the following: that there are things, substances, bodies; that a thing is what it appears to be; that our will is free; that what is good for me is also good in itself.

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.

A casual stroll through the lunatic asylum shows that faith does not prove anything.

I have never come across someone who could inspire more respect than the Greek philosophers.

The criminal type is the type of the strong human being under unfavorable circumstances: a strong human being made sick.

Your highest thought, however, ye shall have it commanded unto you by me - and it is this: man is something that is to be surpassed.