The perseverance of the saints is the biblical teaching that those whom God has truly regenerated and justified will be kept by his power through faith unto final salvation — none shall be lost. This is not a doctrine of presumption or complacency; it is a doctrine of God's faithfulness. The ground of assurance is not human willpower but divine omnipotence: Jesus declares that his sheep "will never perish, and no one will snatch them out of my hand" because "My Father, who has given them to me, is greater than all" (John 10:28–29). Paul grounds assurance in election: "Those whom he justified he also glorified" — the chain from foreknowledge to glorification is unbroken (Romans 8:30). Peter describes believers as those "kept by God's power through faith for a salvation ready to be revealed" (1 Peter 1:5). The saints persevere — but they persevere because God preserves them. The theological name might better be: the preservation of the saints.
PERSEVERANCE, n. Persistence in any business or enterprise undertaken; continued pursuit or prosecution of any business or enterprise begun. In theology, perseverance is continuance in a state of grace to a state of glory; — the doctrine that, if once in a state of grace, a person will not finally fall from it, though he may often sin, and all his sins shall be forgiven him.
• John 10:28–29 — "I give them eternal life, and they will never perish, and no one will snatch them out of my hand."
• Romans 8:30 — "And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified."
• 1 Peter 1:5 — "Who by God's power are being guarded through faith for a salvation ready to be revealed in the last time."
• Philippians 1:6 — "He who began a good work in you will bring it to completion at the day of Jesus Christ."
• John 17:12 — "While I was with them, I kept them in your name, which you have given me. I have guarded them, and not one of them has been lost except the son of destruction."
The doctrine is attacked from two directions. First, Arminian theology teaches that genuine believers can apostatize and lose their salvation through persistent unbelief or willful sin — usually citing Hebrews 6:4–6 and Hebrews 10:26–31. The Reformed response: these passages warn against the sin of apostasy precisely because genuine perseverance includes ongoing faith — those who finally fall away demonstrate they were never truly regenerated (1 John 2:19). The second corruption is the popular "once saved always saved" distortion — a theological antinomian abuse where assurance is grounded in a past prayer rather than present evidence of regeneration. True perseverance includes continuing faith, repentance, and the fruit of the Spirit — not bare profession. The Puritans understood this well: genuine assurance is not "I prayed a prayer" but "I am being transformed."