The infinite! No other question has ever moved so profoundly the spirit of man.

No other question has ever moved so profoundly the spirit of man; no other idea has so fruitfully stimulated his intellect; yet no other concept stands in greater need of clarification than that of the infinite.

If I were to awaken after having slept for a thousand years, my first question would be: Has the Riemann hypothesis been proven?

The spirit of man is more important than mere physical strength, and the spiritual fiber of a nation more than its wealth

When an evil spirit comes out of a man, it goes through arid places seeking rest and does not find it.

No man has ever yet been hanged for breaking the spirit of a law.