What is Inutilis Labor Et Sine Fructu Non Est Effectus Legis?

Legal Definition
Useless and fruitless labar is not the effect of law. Co. Litt. 127b. The law forbids such recoveries whose ends are vain, chargeable, and unprofitable. Id; Wing. Max. p. 110, max. 38.
-- Black's Law Dictionary
Legal Definition
The result of the law is not useless and fruitless labor.
-- Ballentine's Law Dictionary