In art, and in the higher ranges of science, there is a feeling of harmony which underlies all endeavor. There is no true greatness in art or science without that sense of harmony.

Well-being and happiness never appeared to me as an absolute aim. I am even inclined to compare such moral aims to the ambitions of a pig.

We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.

This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

Anti-Semitism is nothing but the antagonistic attitude produced in the non-Jew by the Jewish group. This is a normal social reaction. The Jewish group has thrived on oppression and on the antagonism it has forever met in the world... the root cause is their use of enemies they create in order to keep solidarity.

Playfullness is the essential feature of productive thought.

Out of complexity, find simplicity!