Robert A. Heinlein Behavior Quotations

Selfishness is the bedrock on which all moral behavior starts and it can be immoral only when it conflicts with a higher moral imperative.

Evolution is a process that never stops. Baboons who fail to exhibit moral behavior do not survive; they wind up as meat for leopards.

Morals — all correct moral laws — derive from the instinct to survive. Moral behavior is survival behavior above the individual level.

Since survival is the sine qua non, I now define the "moral behavior" as "behavior that tends toward survival".