I believe, indeed, that overemphasis on the purely intellectual attitude, often directed solely to the practical and factual, in our education, has led directly to the impairment of ethical values.

There exists a passion for comprehension, just as there exists a passion for music. That passion is rather common in children, but gets lost in most people later on. Without this passion there would be neither mathematics nor natural science.

Man usually avoids attributing cleverness to somebody else unless it is an enemy.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

It is certainly true that principles cannot be more securely founded than on experience and consciously clear thinking.

Let every man judge according to his own standards, by what he has himself read, not by what others tell him.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.