"The truth of good economic doctoring is to know the general principles, and to really know the specifics. To understand the context, and also, to understand that an economy may need some tender loving care, not just the so-called hard truths, if it's going to get by."

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Renormalization is just a stop-gap procedure. There must be some fundamental change in our ideas, probably a change just as fundamental as the passage from Bohr's orbit theory to quantum mechanics. When you get a number turning out to be infinite which ought to be finite, you should admit that there is something wrong with your equations, and not hope that you can get a good theory just by doctoring up that number.

— Paul Dirac