There never was a happier or more devoted husband than the male bluebird. He is the gay champion and escort of the female at all times, and while she is sitting, he feeds her regularly.

Fear, love, and hunger were the agents that developed the wits of the lower animals, as they were, of course, the prime factors in developing the intelligence of man.

Birds and animals probably think without knowing that they think; that is, they have not self-consciousness. Only man seems to be endowed with this faculty; he alone develops disinterested intelligence, intelligence that is not primarily concerned with his own safety and well-being but that looks abroad upon things.

A man can get discouraged many times but he is not a failure until he begins to blame somebody else and stops trying.