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When it comes down to it, the root cause of war is always population pressure no matter what other factors enter in.

— Robert A. Heinlein Time for the Stars (1956)

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War

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)

The last half of the 20th century will seem like a wild party for rich kids, compared to what's coming now.

Hunter S. Thompson

Only the dead have seen the end of war.

George Santayana Soliloquies in England and Later Soliloquies (1922)

Wars produce many stories of fiction, some of which are told until they are believed to be true.

Ulysses S. Grant Personal Memoirs of General U. S. Grant (1885)

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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.