Res per pecuniam aestimatur
Res per pecuniam aestimatur, et non pecunia per res. The value of a thing is estimated by its worth in money, and the value of money is not estimated by reference to one thing. 9 Co. 76; 1 Bouv. Inst. n. 922.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.