The human race may well become extinct before the end of the century. Speaking as a mathematician, I should say the odds are about three to one against survival.

No other organization rouses anything like the loyalty aroused by the national State. And the chief activity of the State is preparation for large-scale homicide.

The people who are regarded as moral luminaries are those who forego ordinary pleasures themselves and find compensation in interfering with the pleasures of others.

Calculating machines do sums better than even the cleverest people… As arithmetic has grown easier, it has come to be less respected.

For a good notation has a subtlety and suggestiveness which at times make it seem almost like a live teacher.

Fundamental happiness depends more than anything else upon what may be called a friendly interest in persons and things.

To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.