At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world.

We can allow satellites, planets, suns, universe, nay whole systems of universes, to be governed by laws, but the smallest insect, we wish to be created at once by special act.

On the ordinary view of each species having been independently created, we gain no scientific explanation.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.

I happen to love science... Scientists are all slightly mad. There is truth in the stereotype of the mad scientist. They are mad with curiosity.

And of all illumination which human reason can give, none is comparable to the discovery of what we are, our nature, our obligations, what happiness we are capable of, and what are the means of attaining it.

It seems true that the growth of science and secularism made organized Christianity feel under threat.

I believe that nothing should be taboo - no theory or prejudice should close one's mind to a discovery.