I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.

An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.

A man’s friendships are one of the best measures of his worth.

A moral being is one who is capable of reflecting on his past actions and their motives – of approving of some and disapproving of others.

I am turned into a sort of machine for observing facts and grinding out conclusions.