"It gets to seem as if way back in the Garden of Eden after the fall, Adam and Eve had begged the Lord to forgive them and He, in his boundless exasperation, had said, "All right, then. Stay. Stay in the Garden. Get civilized. Procreate. Muck it up." And they did."

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But think of Adam and Eve like an imaginary number, like the square root of minus one: you can never see any concrete proof that it exists, but if you include it in your equations, you can calculate all manner of things that couldn't be imagined without it.

— Philip Pullman