Universal peace will be realized, not because man will become better, but because a new order of things, a new science, new economic necessities, will impose peace.

Of all earthly creatures, humans alone have the power to choose. One must never lose time in vainly regretting the past nor in complaining about the changes which cause us discomfort, for change is the very essence of life.

Irony is the gaiety of reflection and the joy of wisdom.

It is the certainty that they possess the truth that makes men cruel.

It is well for the heart to be naive and for the mind not to be.

The heart errs like the head; its errors are not any the less fatal, and we have more trouble getting free of them because of their sweetness.

What frightens us most in a madman is his sane conversation.