Whether a man may merit anything from God?

Objections

Objection 1 : It would seem that a man can merit nothing from God. For no one, it would seem, merits by giving another his due. But by all the good we do, we cannot make sufficient return to God, since yet more is His due, as also the Philosopher says (Ethic. viii, 14). Hence it is written (Lk. 17:10): "When you have done all these things that are commanded you, say: We are unprofitable servants; we have done that which we ought to do." Therefore a man can merit nothing from God.
Objection 2 : Further, it would seem that a man merits nothing from God, by what profits himself only, and profits God nothing. Now by acting well, a man profits himself or another man, but not God, for it is written (Job 35:7): "If thou do justly, what shalt thou give Him, or what shall He receive of thy hand." Hence a man can merit nothing from God.
Objection 3 : Further, whoever merits anything from another makes him his debtor; for a man's wage is a debt due to him. Now God is no one's debtor; hence it is written (Rm. 11:35): "Who hath first given to Him, and recompense shall be made to him?" Hence no one can merit anything from God.