… is from page 193 of the 1991 Liberty Press edition of Bruno Leoni’s masterful 1961 volume, Freedom and the Law (original emphasis):
If abiding with legal norms actually depended in the main on coercion, or even on the mere fear of it, the whole process would be so full of frictions and so difficult that it wouldn’t work. It is curious to note how many people are so highly impressed by the peculiar nature of coercion as a purportedly typical ingredient of legal norms that they tend to overlook completely the very marginal significance of coercion in any actual legal order as a whole.
Sanctions and coercions do not make the law; they just assist it in a limited number of cases….