The divinely-wrought turning of a sinner from sin and self to God and Christ — encompassing repentance (turning from) and faith (turning to). Conversion is the visible human side of the new birth: while regeneration is the sovereign work of the Holy Spirit in quickening the dead heart, conversion is the Spirit-empowered response of that newly-alive soul. It involves a thoroughgoing reorientation of allegiance, affection, and direction — from the kingdom of darkness to the Kingdom of God. Conversion is not the end of the Christian journey but its decisive beginning.
CONVER'SION, n. [L. conversio.] In a general sense, the act of turning or changing from one state or condition to another. In theology, a change of heart, or dispositions, in which the enmity of the heart to God and his law is subdued, and right affections are implanted. This change is attributed to the grace of God, and is accompanied by a change of life. Peter's conversation with the Lord: "When thou art converted, strengthen thy brethren."
Modern evangelicalism has often reduced conversion to a one-time "decision" — the raising of a hand or the repeating of a prayer — detached from genuine repentance and costly discipleship. This "easy believism" has produced millions of nominal Christians whose lives show no evidence of actual turning. Conversely, progressive theology denies the necessity of conversion entirely, replacing it with social consciousness or personal authenticity. True conversion is neither a formulaic transaction nor a vague spiritual awakening — it is the decisive, Spirit-worked turning of the whole person to Christ.
Acts 3:19 — "Repent therefore, and turn back, that your sins may be blotted out."
Matthew 18:3 — "Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven."
1 Thessalonians 1:9 — "You turned to God from idols to serve the living and true God."
Ezekiel 36:26 — "I will remove the heart of stone from your flesh and give you a heart of flesh."
Luke 22:32 — "When you have turned again, strengthen your brothers." (Jesus to Peter, anticipating his restoration)
G1994 — ἐπιστρέφω (epistrephō) — to turn around, return, convert; the NT's primary word for conversion
G3340 — μετανοέω (metanoeō) — to repent, change one's mind; the inner dimension of conversion
H7725 — שׁוּב (shûb) — to turn back, return; the primary OT word for conversion and repentance
H2015 — הָפַךְ (hāpak) — to turn, overturn, transform; used of God's radical transformation of a person
"Paul's conversion on the Damascus road was so dramatic that it became the paradigm of God's power to save 'the chief of sinners.'"
"Conversion is not adding Jesus to an unchanged life — it is the total reorientation of the whole person around a new Lord."
"The fruit of genuine conversion is not a perfect record, but a new direction — a life trending toward Christ, not away from Him."