I would rather be the offspring of two apes than be a man and afraid to face the truth.

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

The man who is all morality and intellect, although he may be good and even great, is, after all, only half a man.

The science, the art, the jurisprudence, the chief political and social theories, of the modern world have grown out of Greece and Rome-not by favour of, but in the teeth of, the fundamental teachings of early Christianity, to which science, art, and any serious occupation with the things of this world were alike despicable.

Agnosticism simply means that a man shall not say that he knows or believes that for which he has no grounds for professing to believe.

That which endures is not one or another association of living forms, but the process of which the cosmos is the product, and of which these are among the transitory expressions.

I am not afraid of the priests in the long-run. Scientific method is the white ant which will slowly but surely destroy their fortifications. And the importance of scientific method in modern practical life--always growing and increasing--is the guarantee for the gradual emancipation of the ignorant upper and lower classes, the former of whom especially are the strength of the priests.