Thematic Bible: Supererogation

And thou, son of man, say unto the sons of thy people, The righteousness of the righteous shall not deliver him the day that he rebels; and the wickedness of the wicked shall not impede him in the day that he turns from his wickedness; and the righteous shall not be able to live by his righteousness in the day that he sins. When I am saying to the righteous, Thou shalt shall surely live and he trusting in his own righteousness commits iniquity, all his righteousnesses shall not be remembered; but for his iniquity that he has committed, he shall die for it.

So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable slaves: we have done that which was our duty to do. Verse ConceptsCommands, in NTServants, GoodDuty