Romans 4:7

Blessed are they whose iniquities are forgiven, and whose sins are covered. That is, blessed are those who, by doing penance, have obtained pardon and remission of their sins, and also are covered; that is, newly clothed with the habit of grace, and vested with the stole of charity. (Challoner) --- When it is said that the sins of man are covered, we must not imagine that they still remain, but on account of the goodness of God will not be punished, as the Lutherans contend; for the justice of God could not suffer this: but by it we must understand that they are entirely blotted out, and neither exist, nor are considered any longer by God. Still, we must not conclude that man is blessed, as soon as sin is remitted; since the same psalmist, in another place, ascribes happiness to man when he walks in the law of the Lord, and when he keeps judgment and does justice. (Psalms i; cv; and cviii.) And our Saviour says, If you know these things, blessed shall you be if you do them. (St. John xiii.) (Estius) --- Moreover, if sins were never blotted out, but only covered, why did the royal prophet pray to the Almighty, saying: blot out all mine iniquities; and in different parts of the 50th psalm and psalm cviii, speaking of the egregious sinner, he says: let the sin of his mother not be blotted out; which would mean nothing at all, if sins were never blotted out? (Haydock)