Quod in minori valet
Quod in minori valet, valebit in majori; et quod in majori non valet, nec valebit in minori. What avails in the less, will avail in the greater; and what will not avail in the greater, will not avail in the less. Co. Litt. 260.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.