What the world needs is not dogma but an attitude of scientific inquiry.

I am paid by the word, so I always write the shortest words possible.

Freedom of opinion can only exist when the government thinks itself secure.

All great books contain boring portions, and all great lives have contained uninteresting stretches.

To write tragedy, a man must feel tragedy. To feel tragedy, a man must be aware of the world in which he lives. Not only with his mind, but with his blood and sinews.

Ordinary language is totally unsuited for expressing what physics really asserts, since the words of everyday life are not sufficiently abstract. Only mathematics and mathematical logic can say as little as the physicist means to say.

At all times, except when a monarch could enforce his will, war has been facilitated by the fact that vigorous males, confident of victory, enjoyed it, while their females admired them for their prowess.