The truth isn't always a blinding light. Sometimes it's a deep and dazzling darkness, that illuminates - and burns - just as surely.

A successful man is he who receives a great deal from his fellow men, usually incomparably more than corresponds to his service to them. The value of a man, however, should be seen in what he gives and not in what he is able to receive.

Our entire much-praised technological progress, and civilization generally, could be compared to an axe in the hand of a pathological criminal.

Understanding physics is child's play when compared to understanding child's play.

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.

Every serious scientific worker is painfully conscious of this involuntary relegation to an ever-narrowing sphere of knowledge, which threatens to deprive the investigator of his broad horizon and degrades him to the level of a mechanic.

Education is not received. It is achieved.