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One of the first and most difficult steps in a science is to conceive clearly the nature of the magnitudes about which we are arguing.

William Stanley Jevons
Firsts, Steps, Arguing
William Stanley Jevons (1970). “The Theory of Political Economy”, Penguin (Non-Classics)
One of the first and most difficult steps in a science is to conceive clearly the nature of the magnitudes about which we are arguing.