Never let yourself be seduced by any problem, no matter how difficult.

I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.

Compounding is the 8th wonder of the world.

During the youthful period of mankind's spiritual evolution human fantasy created gods in man's own image, who, by the operations of their will were supposed to determine, or at any rate to influence, the phenomenal world. Man sought to alter the disposition of these gods in his own favour by means of magic and prayer.

When a man is sufficiently motivated, discipline will take care of itself.

We must dedicate our lives to drying up the source of war: ammunition factories.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.