The strength required for the vision of the most powerful reality is not only compatible with the most powerful strength for action, for monstrous action, for crime - it even presupposes it.

Truly, it is a blessing and not a blasphemy when I teach that "above all things there stands the heaven of chance, the heaven of innocence, the heaven of accident, the heaven of wantonness".

Necessity is not an established fact, but an interpretation.

Error has made man so deep, sensitive, and inventive that he has put forth such blossoms as religions and arts. Pure knowledge could not have been capable of it.

The body is a big sagacity, a plurality with one sense, a war and a peace, a flock and a shepherd.

All truly great thoughts are conceived by walking.

The greatest progress that the human race has made lies in learning how to make correct inferences.