The final proof of greatness lies in being able to endure contumely without resentment.

A pessimist is a man who has been compelled to live with an optimist.

The wise way to benefit humanity is to attend to your own affairs, and thus give other people an opportunity to look after theirs.

Those who do unlawful acts are no more sinners in the eyes of God than we who think them.

In the Life of Darwin by his son, there is related an incident of how the great naturalist once studied long as to just what a certain spore was. Finally he said, "It is this, for if it isn't, then what is it?" And all during his life he was never able to forget that he had been guilty of this unscientific attitude, for science is founded on certitude, not assumption.

Miracle: An event described by those to whom it was told by men who did not see it.

No book is of much importance; the vital thing is, What do you yourself think?