Who stops learning may be old.

My opposition to war is not based upon pacifist or non-resistant principles. It may be that the present state of civilization is such that certain international questions cannot be discussed; it may be that they have to be fought out. But the fighting never settles the question. It only gets the participants around to a frame of mind where they will agree to discuss what they were fighting about.

People can have the Model T in any color – so long as it’s black.

A man's real education begins after he has left school. True education is gained through the discipline of life.

If you hope to be independent when there is money, you'll never reach it. On this world, humans can only safely have the knowledge, experience and ability

The time is coming when man will be able to determine the length of his lifespan by controlling his diet.

Nobody can think straight who does not work. Idleness warps the mind.