"Mercy has a great effect which is this: every fault that is regretted has been forgiven, and not only forgotten but wiped out.
Charity demands that we love others; that we follow them with our heart full of love, so that they may get rid of every kind of imperfection. As soon as their fault or imperfection no longer exists, as soon as the soul regretted it and left it so as to walk in the path that leads to God’s service and His glory, then it is time for that perfect mercy, which is in God, which wipes out everything, forgets everything and throws past iniquities into the bottom of the sea.
Not only in the New Testament but in the Old Testament there are words of mercy such as “If your guilt be crimson-dyed it shall turn snow-white" (Isaiah 1:18). God will relent and have mercy on us... burying our sins away sea deep (Micah 7:19). That is the real quality of true mercy: it wipes out, it cancels.
If in the Gospel we see that Our Lord spoke with harshness and severity to those who persisted in their pride and hardness of heart, we see on the contrary that His Heart is open to the greatest sinner as soon as they are converted. It is not the greatness of the fault that counts with God, nor must it be with us; the whole question is the degree to which the soul rejects and detests the fault. A person whose sin is greater but who has completely rejected it, is nearer to God’s heart than another whose sin is less but who remains in it."
—St. Marie Eugénie, 28th October 1879