Human, all too human.

You lovers of knowledge! So what have you done out of your love of knowledge up to now? Have you already stolen and murdered so as to know how a thief and a murderer feels?

I want to know whether you are a person devoted to creating or to exchanging in some respect or other: as a creator you belong tothe free, as an exchanger you are their slave and instrument.

What is bad? -Everything that arises from weakness.

One should not wish to enjoy where one does not give joy.

We should conserve evil just as we should conserve the forests. It is true that by thinning and clearing the forests the earth grew warmer.

Truth is the kind of error without which a certain species of life could not live. The value for life is ultimately decisive.