Augustine of Hippo

Long before Christ it had been said, "You shall not covet"; long before it had been said, "You shall love your neighbor as yourself," a phrase which, as the apostle says, expresses the fulfillment of the whole law. And as no one loves himself unless he loves God, the Lord says that the whole Law and the Prophets depend on these two commandments.

Letter 177 ↗

Gregory the Dialogist

For since it is written in the law: "You shall love your neighbor as yourself," he is proven to love his neighbor less who does not share with him even those things necessary to himself in his neighbor's time of need. Therefore the precept is given about dividing two tunics with one's neighbor, because this could not be said of one tunic, since if one is divided, no one is clothed. For with half a tunic, both he who receives remains naked and he who gave remains naked.

40 Homilies on the Gospels - Homily 20 ↗