Beloved Now the Almighty accommodates to his own purpose what he has just taught us respecting the love of God; for he exhorts us by God's example to brotherly love; as also Paul sets before us Christ, who offered himself to the Father a sacrifice of pleasant fragrance, that every one of us might labor to benefit his neighbors. (Ephesians 5:2.) And John reminds us, that our love ought not to be mercenary, when he bids us to love our neighbors as God has loved us; for we ought to remember this, that we have been loved freely. And doubtless when we regard our own advantage, or return good offices to friends, it is self-love, and not love to others.

Beloved, if God so loved us, we ought also to love one another -
(1) Because he is so much exalted above us, and if he has loved those who were so inferior and so unworthy, we ought to love those who are on a level with us;
(2) because it is only in this way that we can show that we have his Spirit; and,
(3) because it is the nature of love to seek the happiness of all. There are much stronger reasons why we should love one another than there were why God should love us; and unless we do this, we can have no evidence that we are his children.

If God so loved us - Without any reason or consideration on our part, and without any desert in us; we ought also, in like manner, to love one another, and not suspend our love to a fellow-creature, either on his moral worth or his love to us. We should love one another for God's sake; and then, no unkind carriage of a brother would induce us to withdraw our love from him; for if it have God for its motive and model, it will never fail.

(9) Beloved, if God so loved us, we ought also to love one another.
(9) An other reason by comparison: if God so loved us, shall not we his children love one another?

Beloved, if God so loved us,.... As to send his Son to be a propitiatory sacrifice for our sins, and to obtain eternal life for us through his sufferings and death: the apostle uses the same language his Lord and master did, John 3:16;
we ought also to love one another; for those who are the objects of God's love ought to be the objects of ours; and if God has loved our fellow Christians and brethren to such a degree, as to send his Son to die for them, we ought to love them too; and if we are interested in the same love, the obligation is still the greater; and if God loved them with so great a love, when they did not love him, but were enemies to him, then surely we ought to love them now they are become the friends of God, and ours also; as God loved them freely, and when unlovely, and us likewise in the same manner, and under the same circumstances, then we ought to love, and continue to love the saints, though there may be something in their temper and conduct disagreeable: God is to be imitated in his love; and his love to us, which is unmerited and matchless, should influence and engage us to the love of the brethren, who have a far greater claim to our love than we can make to the love of God; and which indeed is none at all, but what he is pleased to give us.

God's love to us is the grand motive for our love to one another (1-John 3:16).
if--as we all admit as a fact.
we . . . also--as being born of God, and therefore resembling our Father who is love. In proportion as we appreciate God's love to us, we love Him and also the brethren, the children (by regeneration) of the same God, the representatives of the unseen God.