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Sin lies only in hurting others unnecessarily. All other "sins" are invented nonsense.

— Robert A. Heinlein Time Enough for Love (1973)

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Religion

More quotes by Robert A. Heinlein

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

Stranger in a Strange Land (1961)

“My uncle used to say, ‘Never pick up a stray kitten…unless you’ve already made up your mind to be owned by it.’”

The Cat Who Walks Through Walls (1985)

I have never been able to see life as anything but a vast complicated practical joke, and it’s better to laugh than cry.

I Will Fear No Evil (1970)

A generation which ignores history has no past —and no future.

Time Enough for Love (1973)

If you would know a man, observe how he treats a cat.

The Door Into Summer (1957)

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All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual towards freedom.

Albert Einstein Moral Decay (1937)

Science and religion are two human enterprises sharing many features.

Freeman Dyson Infinite in All Directions (1988)

The moment the idea is admitted into society, that property is not as sacred as the law of God, and that there is not a force of law and public justice to protect it, anarchy and tyranny commence.

John Adams A Defence of the Constitutions of Government (1787)

The Puritan hated bear-baiting, not because it gave pain to the bear, but because it gave pleasure to the spectators.

Thomas Babington Macaulay History of England (1849)

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Quote text and notes from Wikiquote: Robert A. Heinlein (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.