Rerum progressus ostendunt multa

Rerum progressus ostendunt multa, quae in initio praecaveri seu praevideri non possunt. The progress of time shows many things, which at the beginning could not be guarded against, or foreseen. 6 Co. 40.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.