I refuse to engage in an intellectual battle with an unarmed man.

...Intelligence and character of the masses are incomparably lower than the intelligence and character of the few who produce something valuable for the community.

No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].

Give back to the world at least what you've received.

Common sense invents and constructs no less than its own field than science does in its domain. It is, however, in the nature of common sense not to be aware of this situation.

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.

Mere unbelief in a personal God is no philosophy at all.