To delight in war is a merit in the soldier, a dangerous quality in the captain, and a positive crime in the statesman.

In unphilosophical minds any rare or unexpected thing excites wonder, while in philosophical minds the familiar excites wonder also.

I believe in general in a dualism between facts and the ideas of those facts in human heads.

The philosophy of the common man is an old wife that gives him no pleasure, yet he cannot live without her, and resents any aspersions that strangers may cast on her character.

The need of exercise is a modern superstition, invented by people who ate too much and had nothing to think about.

Columbus gave the world another world.

To be happy you must have taken the measure of your powers, tasted the fruits of your passion, and learned your place in the world.