True life lies in laughter, love and work.

Let a man once see himself as others see him, and all enthusiasm vanishes from his heart.

I do not read a book; I hold a conversation with the author.

Be yourself and think for yourself, and while your conclusions may not be infallible they will be nearer right than the inclusions forced upon you by those who have a personal interest in keeping you in ignorance.

You had better be a round peg in a square hole than a square peg in a square hole. The latter is in for life, while the first is only an indeterminate sentence.

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.

Postponement: The father of failure.