The mind that opens to a new idea never returns to its original size

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

Every kind of peaceful cooperation among men is primarily based on mutual trust and only secondarily on institutions such as courts of justice and police.

It's not that I'm so smart, it's just that I stay with problems longer.

Everything has changed except the way man thinks (when the hydrogen bomb was exploded)

It is a very high goal which, with our weak powers, we can reach only very inadequately, but which gives a sure foundation to our aspirations and valuations.

Imagination is everything. It is the preview of life's coming attractions.