Some things mankind can finish and be done with, but not ... science, that persists, and changes from ancient Chaldeans studying the stars to a new telescope with a 200-inch reflector and beyond; not religion, that persists, and changes from old credulities and world views to new thoughts of God and larger apprehensions of his meaning.

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.

All intelligent faith in God has behind it a background of humble agnosticism.

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.

Liberty is always dangerous, but it is the safest thing we have.

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?

God is not a cosmic bellboy for whom we can press a button to get things.