Theophylact of Bulgaria
Then, showing the excellence of God's love, he says: God did this, that is, He delivered up His own Son for us, not because we loved Him.
Rather, He first began to benefit us out of love and sent His Son. And He not only sent Him, but by His own blood He accomplished the cleansing of our sins.
If, he says, God so loved us, though we are by no means of the same nature as He, then much more ought we to love. We ought to love those akin to us.
Having known the excellence of love, we ought to show it to others.
Just as the one who does not choose what is worthy of choice is guilty, so praise belongs to those who love those worthy of love, because they themselves are beloved.
By disposing ourselves in this way, we have both things. We are loved, because God loves us and has received us to Himself as children. We are beloved, because we love our neighbors.