Law in origin was merely a codification of the power of dominant groups, and did not aim at anything that to a modern man would appear to be justice

But courage in fighting is by no means the only form, nor perhaps even the most important. There is courage in facing poverty, courage in facing derision, courage in facing the hostility of one's own herd. In these, the bravest soldiers are often lamentably deficient. And above all there is the courage to think calmly and rationally in the face of danger, and to control the impulse of panic fear or panic rage.

Mathematics is only the art of saying the same thing in different words.

I used often to go to America during Prohibition, and there was far more drunkenness there then than before; the prohibition of pornography has much the same effect.

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.

All forms of fear produce fatigue.

If all our happiness is bound up entirely in our personal circumstances it is difficult not to demand of life more than it has to give.