Imagination is potentially infinite. Though actually we are limited to the types of experience for which we possess organs, those organs are somewhat plastic. Opportunity will change their scope and even their center.

Man's most serious activity is play.

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

Men become superstitious, not because they have too much imagination, but because they are not aware that they have any.

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

The world is so ordered that we must, in a material sense, lose everything we have and love, one thing after another, until we ourselves close our eyes.

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