We must dedicate our lives to drying up the source of war: ammunition factories.

Life is like a bicycle; keep moving on to maintain balance.

I don't believe in mathematics.

Every day, man is making bigger and better fool-proof things, and every day, nature is making bigger and better fools. So far, I think nature is winning.

As to science, we may well define it for our purpose as "methodical thinking directed toward finding regulative connections between our sensual experiences".

Dostoevsky gives me more than any scientist, more than Gauss.

One may say the eternal mystery of the world is its comprehensibility.