Jesus assigns the second place to mutual kindness among men, for the worship of God is first in order. The commandment to love our neighbors, he tells us, is like the first, because it depends upon it. For, since every man is devoted to himself, there will never be true charity towards neighbors, unless where the love of God reigns; for it is a mercenary love, which the children of the world entertain for each other, because every one of them has regard to his own advantage. On the other hand, it is impossible for the love of God to reign without producing brotherly kindness among men.
When Moses commanded us to love our neighbors as ourselves, he did not intend to put the love of ourselves in the first place, so that a man may first love himself and then love his neighbors; as the sophists of the Sorbonne are went to cavil, that a rule must always go before what it regulates. But as we are too much devoted to ourselves, Moses, in correcting this fault, places our neighbors in an equal rank with us; thus forbidding every man to pay so much attention to himself as to disregard others, because kindness unites all in one body. And by correcting the self-love which separates some persons from others, he brings each of them into a common union, and—as it were—into a mutual embrace. Hence we conclude, that charity is justly pronounced by Paul to be the bond of perfection, (Colossians 3:14,)