Augustine of Hippo
Catena Aurea · Matthäusevangelium 22
But when the Pharisees had heard that he had put the Sadducees to silence, they were gathered together. Then one of them, which was a Lawyer, asked him a question, tempting him, and saying, Master, which is the great commandment in the Law? Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the Law and the Prophets. It follows, On these two commandments hang all the Law and the Prophets.
(De Doctr. Christ. i. 30. et 26.) But since the Divine substance is more excellent and higher than our nature, the command to love God is distinct from that to love our neighbour. But if by yourself, you understand your whole self, that is both your soul and your body, and in like manner of your neighbour, there is no sort of things to be loved omitted in these commands. The love of God goes first, and the rule thereof is so set out to us as to make all other loves center in that, so that nothing seems said of loving yourself. But then follows, Thou shall love thy neighbour as thyself, so that love of yourself is not omitted.