The Federalist Papers · Federalist No. 78 · paragraph 15

This exercise of judicial discretion, in determining between two contradictory laws, is exemplified in a familiar instance. It not uncommonly happens, that there are two statutes existing at one time, clashing in whole or in part with each other, and neither of them containing any repealing clause or expression. In such a case, it is the province of the courts to liquidate and fix their meaning and operation. So far as they can, by any fair construction, be reconciled to each other, reason and law conspire to dictate that this should be done; where this is impracticable, it becomes a matter of necessity to give effect to one, in exclusion of the other. The rule which has obtained in the courts for determining their relative validity is, that the last in order of time shall be preferred to the first. But this is a mere rule of construction, not derived from any positive law, but from the…

Publius · Alexander Hamilton, John Jay, James Madison · 1787–1788
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