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"The instinct to survive is human nature itself, and every aspect of our personalities derives from it. Anything that conflicts with the survival instinct acts sooner or later to eliminate the individual and thereby fails to show up in future generations. . . . A scientifically verifiable theory of morals must be rooted in the individual's instinct to survive--and nowhere else!--and must correctly describe the hierarchy of survival, note the motivations at each level, and resolve all conflicts.We have such a theory now; we can solve any moral problem, on any level. Self-interest, love of family, duty to country, responsibility toward the human race . . . .The basis of all morality is duty, a concept with the same relation to group that self-interest has to individual."
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"The distinction between pretending you are better than you are and beginning to be better in reality is finer than moral sleuth hounds conceive."
"And there, right in the middle of it, I find 'Forgive us our sins as we forgive those that sin against us.' There is no slightest suggestion that we are offered forgiveness on any other terms. It is made perfectly clear that if we do not forgive we shall not be forgiven."
"Taste is the only morality. Tell me what you like and I'll tell you what you are."
"Life is indeed terribly complicated-to a man who has lost his principles."
"If there is something to pardon in everything, there is also something to condemn."
"For when once people have begun to believe that prosperity is the reward of virtue, their next calamity is obvious. If prosperity is regarded as the reward of virtue it will be regarded as the symptom of virtue. Men will leave off the heavy task of making good men successful. He will adopt the easier task of making out successful men good."
"Fearlessness is the first requisite of spirituality. Cowards can never be moral."
"If you do not understand the Golden Rule, which is the most important law in the universe, then you are in trouble. All other rules in your holy books combined - are not as valuable as the ONE Golden Rule. Take two minutes to learn the most crucial law in life. Killing another human comes with the highest penalty, regardless of how you justify it. All life is sacred."
Explore more quotes by Robert A. Heinlein
"One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen."
"I know where I came from-but where did all you zombies come from?I felt a headache coming on, but a headache powder is one thing I do not take. I did once-and you all went away.So I crawled into bed and whistled out the light.You aren't really there at all. There isn't anybody but me-Jane-here alone in the dark.I miss you dreadfully!"
"One of the sanest, surest, and most generous joys of life comes from being happy over the good fortune of others."
"Writing is not necessarily something to be ashamed of, but do it in private and wash your hands afterwards."