Verse explainer
Love isn't just something God approves of — according to John, it's the clearest sign that someone actually knows God at all.
Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
BSBBeloved, let us love one another, because love comes from God. Everyone who loves has been born of God and knows God.
The plain meaning
John has just finished testing spirits by their doctrine (vv. 1–6); now he turns to a second test: love. The two belong together. The false teachers who had left the community (2:19) were marked by both wrong belief and broken love. John's argument here is tight: love originates in God, so the person whose life is shaped by genuine love for others is demonstrating that they have been born from that same source. 'Knoweth God' isn't merely intellectual — it's the lived, relational knowing of someone who has been changed by what they encountered. John isn't saying that any warm feeling qualifies; the surrounding verses (vv. 8–12) define this love concretely by God's sending of his Son. The love John commands is modeled on and drawn from that event. It is received before it is practiced.
The common misreading
What the commentators say
Henry presses the logic hard: love has a 'high and heavenly descent' — it comes from God himself, who is its fountain and author. Because the new nature born in God's children takes its shape from him, and because that shape is love, the presence of genuine love in a person is evidence of genuine new birth. He who loves not, Henry notes from v. 8, thereby reveals that sound knowledge of God has never truly dwelt in him.
Clarke underlines the participatory claim: the one who loves is 'begotten of God' and made a partaker of the divine nature. For Clarke, this love isn't merely commanded from outside — it is the natural complexion of a regenerate soul, because God himself loves and daily loads his creatures with benefits. The more love a person shows, the more of God is visible in them.
JFB situates the verse structurally: it resumes the main theme of 2:29 — love as the test of new birth — while connecting directly to the incarnation just described in vv. 1–6. All three persons of the Godhead are implicated: the Father is love (v. 8), the Son is love embodied in flesh, and the Spirit sheds love abroad as his first fruit. 'Knoweth God' is spiritual, experiential, and habitual knowing — not merely assent.
The word behind it
'Love.' In the Greek of John's letters, agapē is not affection or sentiment but a deliberate, self-giving orientation toward another's good — the same word used for God's love in v. 8 ('God is love') and for his sending of his Son in v. 9. John's point hinges on this: the love he commands is the same species as God's own love, not a human imitation of it but an overflow from the same source. Thayer notes the word carries the sense of prizing and honoring another — an active, choosing love.
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