Baltimore Catechism
Q. 842. How do good works done in mortal sin profit us?
A. Good works done in mortal sin profit us by obtaining for us the grace to repent and sometimes temporal blessings. Mortal sin deprives us of all our merit, nevertheless God will bestow gifts for every good deed as He will punish every evil deed.
Catechism of the Catholic Church****2010 Since the initiative belongs to God in the order of grace,
no one can merit the initial grace of forgiveness and justification, at the beginning of conversion. Moved by the Holy Spirit and by charity,
we can then merit for ourselves and for others the graces needed for our sanctification, for the increase of grace and charity, and for the attainment of eternal life. Even temporal goods like health and friendship can be merited in accordance with God’s wisdom. These graces and goods are the object of Christian prayer. Prayer attends to the grace we need for meritorious actions.
2011 The charity of Christ is the source in us of all our merits before God. Grace, by uniting us to Christ in active love, ensures the supernatural quality of our acts and consequently their merit before God and before men. The saints have always had a lively awareness that their merits were pure grace.
After earth’s exile, I hope to go and enjoy you in the fatherland, but I do not want to lay up merits for heaven. I want to work for your love alone. . . . In the evening of this life, I shall appear before you with empty hands, for I do not ask you, Lord, to count my works. All our justice is blemished in your eyes. I wish, then, to be clothed in your own *justice *and to receive from your love the eternal possession of yourself.63