What is Tempus Enim Modus Tollendi Obligationes Et Actiones, Quia Tempus Currit Contra Desides Et Sui Juris Contemptores?

Legal Definition
For time is a means of destroying obligations and actions, because time runs against the slothful and contemners of their own rights. Fleta, 1. 4, c. 5, § 12.
-- Black's Law Dictionary