There is nothing more necessary than truth, and in comparison with it everything else has only secondary value. This absolute will to truth: what is it? Is it the will to not allow ourselves to be deceived? Is it the will not to deceive? One does not want to be deceived, under the supposition that it is injurious, dangerous, or fatal to be deceived.

I teach the No to all that makes weak--that exhausts. I teach the Yes to all that strengthens, that stores up strength, that pride.

To one who is accustomed to thinking a lot, every new thought that he hears or reads about immediately appears as a link in a chain.

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

There are expressions and bulls-eyes of the spirit, there are epigrams, a little handful of words, in which a whole culture, a whole society is suddenly crystallized.

We are unknown to ourselves, we men of knowledge - and with good reason. We have never sought ourselves - how could it happen that we should ever find ourselves? It has rightly been said: "Where your treasure is, there will your heart be also"; our treasure is where the beehives of our knowledge are.

Creating-that is the great salvation from suffering.