Augustine of Hippo

But the father does not rebuke him as a liar, but commending his stedfastness with him invites him to the perfection of a better and happier rejoicing. Hence it follows, But he said to him, Son, thou art ever with me. (ubi sup.) But what means he that he adds, And all that I have is thine, as if they were not his brother's also? But it is thus that all things are looked at by perfect and immortal children, that each is the possession of all, and all of each. For as desire obtains nothing without want, so charity nothing with want. …

Catena Aurea by Aquinas ↗

Ambrose of Milan

But the kind father was still desirous to save him, saying, Thou art ever with me, either as a Jew in the law, or as the righteous man in communion with Him. For if he ceases to envy, he will feel all things to be his, either as the Jew possessing the sacraments of the Old Testament, or as a baptized person those of the New also. …

Catena Aurea by Aquinas ↗

Jerome

Or after having said, "This is boasting, not truth," the father does not agree with him, but restrains him in another way, saying, Thou art with me, by the law under which thou art bound; not as though he had not sinned, but because God continually drew him back by chastening. Nor is it wonderful that he lies to his father who hates his brother.

Catena Aurea by Aquinas ↗