Truly novel inventions emerge only in one's youth. Later one becomes ever more experienced, famous-and foolish.

The physicist's greatest tool is his wastebasket.

Art is the expression of the profoundest thoughts in the simplest way.

The more a country makes military weapons, the more insecure it becomes: if you have weapons, you become a target for attack.

To the extent math refers to reality, we are not certain to the extent we are certain, math does not refer to reality.

I am doing just fine, considering that I have triumphantly survived Nazism and two wives.

If tomorrow were never to come, it would not be worth living today.