Thematic Bible: Supererogation

"And you, son of man, say to your people, 'The righteousness of the righteous will not deliver him if he rebels. As for the wicked, his wickedness will not make him stumble if he turns from it. The righteous will not be able to live by his righteousness if he sins.' Suppose I tell the righteous that he will certainly live, but he becomes confident in his righteousness and commits iniquity. None of his righteous deeds will be remembered; because of the iniquity he has committed he will die.

So you too, when you have done everything you were commanded to do, should say, 'We are slaves undeserving of special praise; we have only done what was our duty.'" Verse ConceptsCommands, in NTServants, GoodDuty