The greatest productive force is human selfishness.

Do not handicap your children by making their lives easy.

All cats are not gray after midnight.

Being generous is inborn; being altruistic is a learned perversity.

Never appeal to a man's better nature. He may not have one. Invoking his self interest gives you more leverage.

Everybody lies about sex.

Sex should be friendly. Otherwise stick to mechanical toys; it's more sanitary.

You can have peace. Or you can have freedom. Don't ever count on having both at once.

Love is that condition in which the happiness of another person is essential to your own.

A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.