Agnostics are people who, like myself, confess themselves to be hopelessly ignorant concerning a variety of matters, about which metaphysicians and theologians, both orthodox and heterodox, dogmatize with the utmost confidence.

This survival of the fittest which I have here sought to express in mechanical terms, is that which Mr. Darwin has called "natural selection", or the preservation of favoured races in the struggle for life.

What a cage is to the wild beast, law is to the selfish man.

The ultimate result of shielding men from the effects of folly, is to fill the world with fools.

Whatever fosters militarism makes for barbarism; whatever fosters peace makes for civilization.

Time: That which man is always trying to kill, but which ends in killing him.

Life is not for learning nor is life for working, but learning and working are for life.