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

Common sense consists of those layers of prejudice laid down before the age of 18.

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.

I see only with deep regret that God punishes so many of His children for their numerous stupidities, for which only He Himself can be held responsible; in my opinion, only His nonexistence could excuse Him.

What counts can't always be counted; what can be counted doesn't always count.

All these constructions and the laws connecting them can be arrived at by the principle of looking for the mathematically simplest concepts and the link between them.

As long as there will be a man, there will be wars.