Merit is what is earned. It is that which entitles the doer of a good work to receive a reward or payment for a service or action. 

In Roman Catholicism, "By merit (meritum) in general is understood that property of a good work which entitles the doer to receive a reward (prœmium, merces) from him in whose service the work is done."1

  • 1. Catholic Encyclopedia, merit,