"I myself am more and more inclined to agree with Omar and Satchel Paige as I grow older: Don't try to rewrite what the moving finger has writ, and don't ever look over your shoulder."

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Mathematicians have never been in full agreement on their science, though it is said to be the science of self-evident verities -- absolute, indisputable and definitive. They have always been in controversy over developing aspects of mathematics, and they have always considered their own age to be in a period of crisis.

— Henri Lebesgue