Short answer: Psalm 138:8 is David's confidence that God will bring to completion what He has started in his life. The Hebrew verb means to finish or bring to an end — so the verse is less "God will make my life perfect" and more "God will not abandon a work He began."
The context: a thanksgiving song in the middle of trouble
Psalm 138 is titled "A Psalm of David." It opens with wholehearted praise (vv. 1–3) and moves outward: kings of the earth will praise God (vv. 4–5), and God, though high, regards the lowly (v. 6). Verse 7 is the key setup — David says that even walking in the midst of trouble, God revives him. Verse 8 is the conclusion he draws from all of it. This is not a psalm written from safety; it is written from the middle of a threat, and that is what makes the confidence notable.
What it means, phrase by phrase
The King James Version reads: "The LORD will perfect that which concerneth me: thy mercy, O LORD, endureth for ever: forsake not the works of thine own hands" (Psalm 138:8).
- "The LORD will perfect that which concerneth me" — The Hebrew verb here (gamar) carries the sense of completing or bringing to an end, which is why translations vary so widely. The KJV has "perfect that which concerneth me"; others render it "fulfill his purpose for me," and a few read it as a plea for vindication. The common thread in all of them: God finishes what He starts. "Perfect" in older English means complete, not flawless.
- "thy mercy, O LORD, endureth for ever" — The reason David can be confident is not his own progress but God's covenant loyalty (hesed), the refrain that runs through the Psalms (see Psalm 136).
- "forsake not the works of thine own hands" — Notice the shift from statement to prayer. David is confident and still asking. He appeals on the ground that he is God's own handiwork — an argument God has an interest in His own work.
Read together, the verse holds two things at once: settled trust and honest petition. It is not a claim that everything will turn out comfortable. It is a claim that God does not walk away from unfinished projects.
Cross-references
- Philippians 1:6 — "he which hath begun a good work in you will perform it until the day of Jesus Christ" (KJV). The clearest New Testament echo.
- Psalm 57:2 — David again: "unto God that performeth all things for me" (KJV).
- Isaiah 64:8 — "we are the clay, and thou our potter; and we all are the work of thy hand" (KJV).
- Psalm 136:1 — The refrain that God's mercy "endureth for ever."
- Ephesians 2:10 — Believers are God's workmanship, made for good works.
How to apply Psalm 138:8 today
This verse is most useful to people who feel half-finished — a habit not yet broken, a healing not yet complete, a calling still unclear. David's logic is worth borrowing: he does not measure God's commitment by how far along he is. He measures it by God's steadfast love, which does not run out.
Two cautions keep the verse honest. First, "perfect" does not promise the outcome you have in mind; David was still in trouble when he wrote it. Second, the verse ends in a request, not a guarantee of ease — so praying it is entirely appropriate. Faithful Christians differ on how much of this promise applies to circumstances versus to spiritual formation; the safest reading is the one the words support plainly — God will complete what concerns you, on His terms and timeline.
Frequently Asked Questions
Why do translations of Psalm 138:8 differ so much? The Hebrew verb means to complete or bring to an end, and the object ("that which concerneth me") is compact and open-ended. Translators have to decide whether the sense is completing God's purpose, completing David's cause, or vindicating him. All are defensible renderings of the same clause.
Does Psalm 138:8 promise my problems will be fixed? Not directly. Verse 7 shows David still walking through trouble. The promise is about God's faithfulness to finish His work, not about the removal of hardship. Many readers find that distinction is what makes the verse durable.
Is Psalm 138:8 about salvation or about daily life? The psalm is a general expression of trust, so it covers both. Christians often pair it with Philippians 1:6, which applies the same logic specifically to God's ongoing work in a believer. Neither passage limits it to one sphere.
Who wrote Psalm 138? The superscription attributes it to David. Its themes — praise before kings, God's regard for the lowly, deliverance in trouble — fit the pattern of David's other psalms of thanksgiving.