A person unlearns arrogance when he knows he is always among worthy human beings; being alone fosters presumption. Young people are arrogant because they always associate with their own peers, those who are all really nothing but who would like to be very important.

Regarding life, the wisest men of all ages have judged alike: it is worthless.

Science rushes headlong, without selectivity, without "taste," at whatever is knowable, in the blind desire to know all at any cost.

What do you believe in?--In this, that the weights of all things must be determined anew.

Beware of spitting against the wind!

We possess art lest we perish of the truth.

Historical refutation as the definitive refutation.- In former times, one sought to prove that there is no God - today one indicates how the belief that there is a God arose and how this belief acquired its weight and importance: a counter-proof that there is no God thereby becomes superfluous.- When in former times one had refuted the 'proofs of the existence of God' put forward, there always remained the doubt whether better proofs might not be adduced than those just refuted: in those days atheists did not know how to make a clean sweep.