My thinking is first and last and always for the sake of my doing, and I can only do one thing at a time.

The self-same atoms which, chaotically dispersed, made the nebula, now, jammed and temporarily caught in peculiar positions, form our brains; and the 'evolution' of brains, if understood, would be simply the account of how the atoms came to be so caught and jammed.

The great use of life is to spend it for something that will outlast it." "This life is worth living, we can say, since it is what we make it." "Believe that life is worth living and your belief will help create the fact.

Man can alter his life by altering his thinking.

The love of life, at any and every level of development, is the religious impulse.

Mankind's common instinct for reality has always held the world to be essentially a theatre for heroism.

If this life is not a real fight, in which something is eternally gained for the universe by success, it is no better than a game of private theatricals from which one may withdraw at will. But it feels like a real fight.