Thematic Bible: Supererogation

And thou, son of man, say to the sons of my people, The justice of the just shall not deliver him in the day of his transgression: and the injustice of the unjust, he shall not stumble in it in the day of his turning back from his injustice; and the just shall not be able to live in the day of his sinning. In my saying to the just, living, he shall live; and he trusted upon his justice, and he did evil, all his justice shall not be remembered; and in his iniquity which he did he shall die in it

So also ye, when ye do all appointed you, say, That we are useless servants: for what we ought to do, we have done. Verse ConceptsCommands, in NTServants, GoodDuty