We ought, all of us, to realize each other in this intense, pathetic, and important way. If you say that this is absurd, and that we cannot be in love with everyone at once, I merely point out to you that, as a matter of fact, certain persons do exist with an enormous capacity for friendship and for taking delight in other people's lives; and that such persons know more of truth than if their hearts were not so big.

Pessimism leads to weakness. Optimism leads to power.

Our belief at the beginning of a doubtful undertaking is the one thing that assures the successful outcome of any venture.

Philosophy lives in words, but truth and fact well up into our lives in ways that exceed verbal formulation. There is in the living act of perception always something that glimmers and twinkles and will not be caught, and for which reflection comes too late.

Philosophy is "an unusually stubborn attempt to think clearly.

Why should we think upon things that are lovely? Because thinking determines life. It is a common habit to blame life upon the environment. Environment modifies life but does not govern life. The soul is stronger than its surroundings.

Man can change his life simply by changing his attitude.