Friedrich Nietzsche vs. Robert A. Heinlein

"Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the…"

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

"May you live as long as you wish and love as long as you live."

"Free will was another matter. It could not be laughed off, because it could be directly experienced—yet his own free will had worked to create the same scene…"

"I now define "moral behavior" as "behavior that tends toward survival." I won't argue with philosophers or theologians who choose to use the word "moral" to …"

"Luck is a bonus that follows careful planning—it’s never free."

"I really am a good listener because you never can tell when you will pick up something useful—and all in the world any woman has to do to be considered “char…"

"When you haven’t data, guessing is illogical."

"Some people insist that 'mediocre' is better than 'best.' They delight in clipping wings because they themselves can't fly. They despise brains because they …"

"Since when did a mathematician need any tools but his own head? Pythagoras had done well enough with a stick and a stretch of sand."

"At fourteen months he began speaking in sentences, short and of his own structure, but sentences. The subjects of his conversation, or, rather, his statement…"

"I've heard all the usual Sweetness and Light that kids get pushed at them—how they should always forgive, how there’s some good in the worst of us, etc. But …"

"I have never been impressed by the formal schools of ethics. I had sampled them — public libraries are a ready source of recreation for an actor short of cas…"

"I trust that I am honest with myself. I know that I am not very sociable and I expect to go on being so; a man capable of creative work has no time to spare …"

"Don, have you been dealing with a booklegger?"

"Like many a man before him, he found himself forced into a lie because the truth simply would not be believed."

"Apparently she believes she is safe. Evil is essentially stupid, Joe; despite her brilliance, she believes what she wishes to believe. Or it may be that she …"

"Sex is rearing its interesting head."

"I had taken a partner once before—but, damnation, no matter how many times you get your fingers burned, you have to trust people. Otherwise you are a hermit …"

"As for population, every major shortcoming of our native planet could be traced to one cause: too many people, not enough planet."