Condign merit
Encyclopedia
Condign merit is an aspect of Roman Catholic theology signifying merit with the dignity of Christ. A person born again in Christ, does not merit of his own virtue but the virtues of Christ are applied to his work. Therefore it is God crowning His works. Congruent merit, is the equivalent of condigno merit but applied to an unregenerated person by the goodness of God. In the first case, God has obligated Himself, by His promises to reward His Son's merits in His children. In the second case, God bestows his merit to those who seek Him in faith not from obligation but from mercy and love. In neither case is God obligated by the human. In the first case, God is obligated by His promises to those who love Him. In the second, God is obligated by His love and mercy to His creatures who obey Him.

In some formulations of Calvinism
Calvinism
Calvinism is a Protestant theological system and an approach to the Christian life...

, condign merit is not needed because Jesus
Jesus
Jesus of Nazareth , commonly referred to as Jesus Christ or simply as Jesus or Christ, is the central figure of Christianity...

' Atonement is a congruent merit where God gives merit.

Condign merit supposes an equality between service and return; it is measured by commutative justice, and thus gives a real claim to a reward in the name of Christ. Congruous merit, owing to its inadequacy and the lack of intrinsic proportion between the service and the recompense, claims a reward only on the ground of equity. This early-scholastic distinction and terminology, which is already recognized in concept and substance by the Fathers of the Church in their controversies with the Pelagians and Semipelagians
Semipelagianism
Semipelagianism is a Christian theological and soteriological school of thought on salvation; that is, the means by which humanity and God are restored to a right relationship. Semipelagian thought stands in contrast to the earlier Pelagian teaching about salvation , which had been dismissed as...

, were again emphasized by Johann Eck
Johann Eck
Dr. Johann Maier von Eck was a German Scholastic theologian and defender of Catholicism during the Protestant Reformation. It was Eck who argued that the beliefs of Martin Luther and Jan Hus were similar.-Life:...

, the adversary of Martin Luther
Martin Luther
Martin Luther was a German priest, professor of theology and iconic figure of the Protestant Reformation. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He confronted indulgence salesman Johann Tetzel with his Ninety-Five Theses in 1517...

.

The essential difference between condign merit and congruent merit is based on the fact that, besides those works which claim a remuneration under pain of violating strict justice (as in contracts between employer and employee, in buying and selling, etc.), there are also other meritorious works which at most are entitled to reward or honour for reasons of equity or mere distributive justice , as in the case of gratuities and military decorations. From an ethical point of view the difference practically amounts to this that, if the reward due to condign merit be withheld, there is a violation of right and justice and the consequent obligation in conscience to make restitution, while, in the case of congruous merit, to withhold the reward involves no violation of right and no obligation to restore, it being merely an offence against what is fitting or a matter of personal discrimination. Hence the reward of congruous merit always depends in great measure on the kindness and liberality of the giver, though not purely and simply on his good will.

Sources

Merit Catholic Encyclopedia http://www.newadvent.org/cathen/10202b.htm
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