Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.

Whoever is careless with the truth in small matters cannot be trusted in important affairs.

Schools need not preach political doctrine to defend democracy. If they shape men capable of critical thought and trained in social attitudes, that is all that is necessary.

Relativity teaches us the connection between the different descriptions of one and the same reality.

It is not by sitting still at a grand distance and calling the human race larvae that men are to be helped.

Today we must abandon competition and secure cooperation. This must be the central fact in all our considerations of international affairs; otherwise we face certain disaster. Past thinking and methods did not prevent world wars. Future thinking must prevent wars...The stakes are immense, the task colossal the time is short. But we may hope- we must hope- that man's own creation, man's own genius, will not destroy him.

How can any educated person stay away from the Greeks? I have always been far more interested in them than in science.