O my God, by my grievous sins I have re-crucified Thy divine Son to myself and have deserved Thy everlasting wrath in the fires of hell. Even more, I have been most ungrateful by my sins to Thee, my Heavenly Father, Who have created me out of nothing, redeemed me by Thy Son, and sanctified me in the sacraments by Thy Holy Spirit. But Thou hast spared me to make this confession. Receive me back as Thy prodigal son and grant me to confess myself well, that I may begin anew to love Thee with my whole heart and soul, henceforth keeping Thy Commandments and suffering patiently whatever temporal punishment for my sins may remain. I hope by Thy goodness and power to obtain everlasting life in paradise. Through Christ Our Lord. Amen.
(A good reading for Confession is the Gospel of St. Luke 15:11-32; the Parable of the Prodigal Son.)