Verse explainer

What does 2 Peter 3:18 really mean?

Peter's closing word isn't a soft farewell — it's a command: Christian life is meant to move forward, not idle at conversion.

KJV

But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.

BSB

But grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory both now and to the day of eternity. Amen.

The plain meaning

Peter ends his second letter with a sharp warning about false teachers who lead people into error (v. 17), then pivots immediately to the antidote: grow. The command is active and ongoing — not a one-time arrival but a sustained movement. Two things are to grow together: grace (the undeserved favor and transforming work of God in the believer) and knowledge — specifically, the experiential, deepening knowledge of Jesus Christ himself. Jamieson, Fausset, and Brown note that this is "the grace of which Christ is the author, and the knowledge of which Christ is the object" — both gifts flow from the same source. Adam Clarke captures the urgency: the believer who stops growing is like an infant who isn't gaining weight — a sign of sickness, not health. The doxology that closes the verse — "to him be glory both now and for ever" — makes clear that growth is not self-improvement; it is Christ's work, offered back to Christ in praise. The phrase rendered "for ever" in the KJV is literally "to the day of eternity" in the Greek — the day that has no end, which gives the whole command its horizon.

The common misreading

"Grow in grace" means becoming a better, more disciplined person through spiritual effort. The verse is frequently read as a self-improvement command — a call to try harder, pray more, be more devout, and thereby accumulate more of God's approval. But the grammar and the context work against that reading. Grace in the New Testament epistles is consistently something received, not achieved — it is God's unmerited favor and transforming action in the believer, not a spiritual skill one builds up. Gill notes that growth in grace is ultimately "God's work, to cause them to grow," even as believers use the means he provides. Clarke reinforces this: the grace already received is a seed, and growth comes by keeping that seed in the conditions where God waters it — Word, prayer, trust — not by straining harder in one's own strength. The closing doxology seals it: "to him be glory both now and for ever." If growth were self-generated, the glory would belong partly to the grower. Peter assigns it entirely to Christ. The antidote to false teaching (v. 17) is not greater human resolve but a deeper, more experiential knowing of the person of Jesus — which is itself a gift, not a conquest.

What the commentators say

Adam Clarkeearly 19th c. · PD

Clarke sees the Christian life as a biological growth: every grace received at conversion is a seed that must be watered and cultivated or it will wither. He is pointed that those who boast only of their conversion grace and seek no further growth are spiritually infantile — and that the infant who does not grow daily is sickly and near death. Growth in grace is not optional flourishing; it is evidence of life.

John Gill18th c. · PD

Gill distinguishes the means of growth from the source: God causes the growth, but believers are to use the means — prayer, the Word, the promises, recalling past experiences of God's faithfulness. He also ties growing knowledge of Christ directly to the letter's warning context: an experimental, deepening knowledge of Christ is the surest protection against the false teaching Peter has spent the letter confronting.

Jamieson, Fausset & Brown19th c. · PD

JFB observe that Peter's final command — "grow" — is the true secret of not going backward. Standing still in the Christian life is functionally retreating. They also note the closing doxology points to "the day of eternity," a day without end, which frames all present growth as aimed at and consummated in the endless day of the Lord's appearing.

The word behind it

αὐξάνω auxanō

"Grow" or "increase" — a verb used of organic, living growth, as of plants or children. It is present-tense imperative here, meaning continuous, ongoing action: keep growing, not merely begin to grow. The word implies that the Christian is a living organism, not a finished statue. Growth is not automatic; it requires conditions — but it is the natural direction of life, not an achievement to be forced.

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