Augustine of Hippo — as excerpted in the Catena Aurea on Luke 15:17-24

“(ubi sup.) For he was lying down. And I will go, for he was a long way off. To my father, because he was under a master of swine. But the other words are those of one meditating repentance in confession of sin, but not yet working it. For he does not now speak to his father, but promises that he will speak when he shall come. You must understand then that this “coming to the father” must now be taken for being established in the Church by faith, where there may yet be a lawful and effectual confession of sins. He says then that he will say to his father, Father.”