Augustine of Hippo
Catena Aurea · Lukasevangelium 15
And when he came to himself, he said, How many hired servants of my father’s have bread enough and to spare, and I perish with hunger! I will arise and go to my father, and will say unto him, Father, I have sinned against heaven, and before thee, And am no more worthy to be called thy son: make me as one of thy hired servants. And he arose, and came to his father. But when he was yet a great way off, his father saw him, and had compassion, and ran, and fell on his neck, and kissed him. And the son said unto him, Father, I have sinned against heaven, and in thy sight, and am no more worthy to be called thy son. But the father said to his servants, Bring forth the best robe, and put it on him; and put a ring on his hand, and shoes on his feet: And bring hither the fatted calf, and kill it; and let us eat, and be merry: For this my son was dead, and is alive again; he was lost, and is found. And they began to be merry.
(ubi sup.) But whence could he know this who had that great forgetfulness of God, which exists in all idolaters, unless it was the reflection of one returning to his right understanding, when the Gospel was preached. Already might such a soul see that many preach the truth, among whom there were some not led by the love of the truth itself, but the desire of getting worldly profit, who yet do not preach another Gospel like the heretics. Therefore are they rightly called mercenaries. For in the same house there are men who handle the same bread of the word, yet are not called to an eternal inheritance, but hire themselves for a temporal reward.