This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

The point is to develop the childlike inclination for play and the childlike desire for recognition and to guide the child over to important fields for society. Such a school demands from the teacher that he be a kind of artist in his province.

I made one great mistake in my life-when I signed the letter to President Roosevelt recommending that atom bombs be made but there was some justification-the danger that the Germans would make them.

I am doing just fine, considering that I have triumphantly survived Nazism and two wives.

The truth of a theory is in your mind, not in your eyes.

Conventional words or other signs have to be sought for laboriously only in a second stage, where the associative play already referred to is sufficiently established and can be reproduced at will.

The right to search for truth implies also a duty.