While each of us ... has depressed hours, none of us needs to be a depressed person.

The most extraordinary thing about the oyster is this. Irritations set into his shell. He does not like them. But when he cannot get ride of them, he uses the irritation to do the loveliest thing an oyster ever has a chance to do. If there are irritations in our lives today, there is only one prescription: make a pearl. It may have to be a pearl of patience, but anyhow, make a pearl. And it takes faith and I love to do it.

Men will work hard for money. They will work harder for other men. But men will work hardest of all when they are dedicated to a cause. Until willingness overflows obligation, men fight as conscripts rather than following the flag as patriots. Duty is never worthily performed until it is performed by one who would gladly do more if only he could.

Every great scientist becomes a great scientist because of the inner self-abnegation with which he stands before truth, saying: "Not my will, but thine, be done." What, then, does a man mean by saying, Science displaces religion, when in this deep sense science itself springs from religion?

Life consists not simply in what heredity and environment do to us, but in what we make out of what they do to us

One must have the adventurous daring to accept oneself as a bundle of possibilities and undertake the most interesting game in the world -- making the most of one's best.

It is magnificent to grow old, if one keeps young.