You imagine that I look back on my life's work with calm satisfaction. But from nearby it looks quite different. There is not a single concept of which I am convinced that it will stand firm, and I feel uncertain whether I am in general on the right track.

The ability to portray people in still life and in motion requires the highest measure of intuition and talent.

It is harder to crack prejudice than an atom.

Time and space are not conditions of existence, time and space is a model for thinking

Without the sense of fellowship with men of like mind... life would have seemed to me empty.

He who cherishes the value of cultures cannot fail to be a pacifist.

I want to know the thoughts of God. Everything else is just details.