"The foregoing history may not be precisely accurate in every particular; but I am sure it is sufficiently so, for all the uses I shall attempt to make of it, and in it, we have before us, the chief material enabling us to correctly judge whether the repeal of the Missouri Compromise is right or wrong."

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Numbers are the product of counting. Quantities are the product of measurement. This means that numbers can conceivably be accurate because there is a discontinuity between each integer and the next. Between two and three there is a jump. In the case of quantity, there is no such jump; and because jump is missing in the world of quantity, it is impossible for any quantity to be exact. You can have exactly three tomatoes. You can never have exactly three gallons of water. Always quantity is approximate.

— Gregory Bateson