Reason is mechanical, wit chemical, and genius organic spirit.

When the author has no idea of what to reply to a critic, he then likes to say: you could not do it better anyway. This is the same as if a dogmatic philosopher reproached a skeptic for not being able to devise a system.

The main thing is to know something and to say it.

If the essence of cynicism consists in preferring nature to art, virtue to beauty and science; in not bothering about the letter of things -- to which the Stoic strictly adheres -- but in looking up to the spirit of things; in absolute contempt of all economic values and political splendor, and in courageous defence of the rights of independent freedom; then Christianity would be nothing but universal cynicism.

We should never invoke the spirit of antiquity as our authority. Spirits are peculiar things; they cannot be grasped with the hands and be held up before others. Spirits reveal themselves only to spirits. The most direct and concise method would be, in this case as well, to prove the possession of the only redeeming faith by good works.

Publication is to thinking as childbirth is to the first kiss.

Religion is absolutely unfathomable. Always and everywhere one can dig more deeply into infinities.