Genius is making complex ideas simple, not making simple ideas complex

Playfullness is the essential feature of productive thought.

If only I had known, I should have become a watchmaker.

Through the release of atomic energy, our generation has brought into the world the most revolutionary force since prehistoric man's discovery of fire. This basic force of the universe cannot be fitted into the outmoded concept of narrow nationalisms.

Pure logical thinking cannot yield us any knowledge of the empirical world. All knowledge of reality starts from experience and ends in it.

Those instrumental goods which should serve to maintain the life and health of all human beings should be produced by the least possible labour of all.

I was just more stubborn and more passionate than most about physics.