We must have the real thing before we can have a science of a thing.

There are at bottom but two possible religions--that which rises in the moral nature of man, and which takes shape in moral commandments, and that which grows out of the observation of the material energies which operate in the external universe.

A single seed of fact will produce in a season or two a harvest of calumnies; but sensible men will pay no attention to them.

The secret of a person's nature lies in their religion and what they really believes about the world and their place in it.

Science rests on reason and experiment, and can meet an opponent with calmness; [but] a creed is always sensitive.

Men are made by nature unequal. It is vain, therefore, to treat them as if they were equal.

We live merely on the crust or rind of things.