Cyril of Alexandria
Catena Aurea · Lukasevangelium 15
And he said, A certain man had two sons: And the younger of them said to his father, Father, give me the portion of goods that falleth to me. And he divided unto them his living. And not many days after the younger son gathered all together, and took his journey into a far country, and there wasted his substance with riotous living. And when he had spent all, there arose a mighty famine in that land; and he began to be in want. And he went and joined himself to a citizen of that country; and he sent him into his fields to feed swine. And he would fain have filled his belly with the husks that the swine did eat: and no man gave unto him. It follows, And he began to be in want. Fitly did he begin to be in want who abandoned the treasures of the wisdom and the knowledge of God, and the unfathomableness of the heavenly riches. It follows, And he went and joined himself to a citizen of that country.
But since the Jews are frequently reproved in holy Scripture for their many crimes, how agree with this people the words of the elder son, saying, Lo, these many years do I serve thee, neither transgressed I at any time thy commandment. (Jer. 2:5, Isa. 29:13.) This then is the meaning of the parable. The Pharisees and Scribes reproved Him because He received sinners; He set forth the parable in which He calls God the man who is the father of the two sons, (that is, the righteous and the sinners,) of whom the first degree is of the righteous who follow righteousness from the beginning, the second is of those men who are brought back by repentance to righteousness.