In this is love, not that we have loved God but that he loved us and sent his Son to be the propitiation for our sins.
10 Herein is love He amplifies God’s love by another reason, that he gave us his own Son at the time when we were enemies, as Paul teaches us, in Romans 5:8; but he employs other words, that God, induced by no love of men, freely loved them. He meant by these words to teach us that God’s love towards us has been gratuitous.
As the Spirit of truth is known by doctrine (thus spirits are to be tried), it is known by love likewise; and so here follows a strong fervent exhortation to holy Christian love: Beloved, let us love one another, Jo1 4:7.
Commenting on 1 John 4:7-13
Herein is love,.... The love of God, free love, love that cannot be matched: herein it is manifested, as before; this is a clear evidence of it, an undoubted proof, and puts it out of all question: not that we loved God: the love of God is antecedent to the love of his people; it was when theirs was not; when they were without love...