It is not worth while to strain one's self to tell the truth to people who habitually discount everything you tell them, whether it is true or isn't.

There is no God, no universe, no human race, no earthly life, no heaven, no hell. It is all a dream, a grotesque and foolish dream. Nothing exists but you. And you are but a thought -a vagrant thought, a useless thought, a homeless thought, wandering forlorn among the empty eternities!

The universal brotherhood of man is our most precious possession.

Principles have no real force except when one is well-fed.

in order to make a man or boy covet a thing, it is only necessary to make the thing difficult to attain.

The physician who knows only medicine, knows not even medicine.

Success is a journey, not a destination. It requires constant effort, vigilance and reevaluation.