Man is a tool-using animal.

A laugh, to be joyous, must flow from a joyous heart, for without kindness, there can be no true joy.

Endurance is patience concentrated.

Out of the lowest depths there is a path to the loftiest heights.

Battles, in these ages, are transacted by mechanism; with the slightest possible development of human individuality or spontaneity; men now even die, and kill one another, in an artificial manner.

It is the first of all problems for a man to find out what kind of work he is to do in this universe.

No great man lives in vain. The history of the world is but the biography of great men.