The extreme rarity of transitional forms in the fossil record persists as the trade secret of paleontology.

Father in Heaven! When the thought of thee wakes in our hearts let it not awaken like a frightened bird that flies about in dismay, but like a child waking from its sleep with a heavenly smile.

If a man cannot forget, he will never amount to much.

Life is lived forwards, but understood backwards.

Dread is a sympathetic antipathy and an antipathetic sympathy.

In a theatre it happened that a fire started off stage. The clown came out to tell the audience. They thought it was a joke and applauded. He told them again, and they became still more hilarious. This is the way, I suppose, that the world will be destroyed-amid the universal hilarity of wits and wags who think it is all a joke.

Knowledge is an attitude, a passion, actually an illicit attitude. For the compulsion to know is like dipsomania, erotomania, and homicidal mania, in producing a character that is out of balance. It is not at all that the scientist goes after the truth.