I believe four ingredients are necessary for happiness: health, warm personal relations, sufficient means to keep you from want, and successful work.

There are certain things that our age needs. It needs, above all, courageous hope and the impulse to creativeness.

One of the symptoms of approaching nervous breakdown is the belief that one's work is terribly important, and that to take a holiday would bring all kinds of disaster. If I were a medical man, I should prescribe a holiday to any patient who considered his or her work important.

I wish to propose for the reader's favourable consideration a doctrine which may, I fear, appear wildly paradoxical and subversive. The doctrine in question is this: that it is undesirable to believe a proposition when there is no ground whatever for supposing it true.

Love should be a tree whose roots are deep in the earth, but whose branches extend into heaven.

All forms of fear produce fatigue.

Suppose atomic bombs had reduced the population of the world to one brother and sister; should they let the human race die out?