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Nobody knows how many universes there are. Theory places no limit: any and all possibilities in unlimited number of combinations of "natural" laws, each sheaf appropriate to its own universe. But this is just theory and Occam's Razor is much too dull.

— Robert A. Heinlein Glory Road (1967)

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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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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.