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Logic is a feeble reed, friend. "Logic" proved that airplanes can't fly and that H-bombs won't work and that stones don't fall out of the sky. Logic is a way of saying that anything which didn't happen yesterday won't happen tomorrow.

— Robert A. Heinlein Glory Road (1963)

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Mind

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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The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents.

H. P. Lovecraft The Call of Cthulhu (1926)

Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.

Kenneth Boulding to Kenneth Boulding in: United States. Congress. House (1973)

The greater part of humanity is too much harassed and fatigued by the struggle with want, to rally itself for a new and sterner struggle with error.

Friedrich Schiller On the Aesthetic Education of Man (1794)

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

George Bernard Shaw Maxims for Revolutionists (1903)

Attribution

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.