The most aggravating thing about the younger generation is that I no longer belong to it.

We must be prepared to make the same heroic sacrifices for the cause of peace that we make ungrudgingly for the cause of war.

Man would indeeded be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

[Freud's] sense of reality is less clouded by wishful thinking than is the case with other people and [he combines] the qualities of critical judgment, earnestness and responsibility.

Genius abhors consensus because when consensus is reached, thinking stops. Stop nodding your head.

Epistemology without contact with science becomes an empty scheme. Science without epistemology is-insofar as it is thinkable at all-primitive and muddled.

It's very depressing to live in a time where it's easier to break an atom than a prejudice.