Morals— all correct moral laws— derive from the instinct to survive. Moral behavior is survival behavior above the individual level.
– Robert A Heinlein (Starship Troopers)
Correct morality can only be derived from what man is—not from what do-gooders and well-meaning aunt Nellies would like him to be.
– Robert A Heinlein (Starship Troopers)
