„I do not think anyone can define “behavior that tends toward extinction” as being “moral” without stretching the word “moral” all out of shape.“

— Robert A. Heinlein

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„I think if we study the primates, we notice that a lot of these things that we value in ourselves, such as human morality, have a connection with primate behavior.“
— Jane Goodall
„In their behavior toward creatures, all men are Nazis. Human beings see oppression vividly when they're the victims. Otherwise they victimize blindly and without a thought.“
— Isaac Bashevis Singer
„Evolution is a process that never stops. Baboons who fail to exhibit moral behavior do not survive; they wind up as meat for leopards.“
— Robert A. Heinlein
„The next level in moral behavior higher than that exhibited by the baboon is that in which duty and loyalty are shown toward a group of your own kind too large for an individual to know all of them. We have a name for that. It is called "patriotism."“
— Robert A. Heinlein