Paul’s phrase for the believer’s former self or former identity in Adam, marked by sin and the old way of life. It is best understood as the old person we were before union with Christ, not as a separate substance Scripture labels a “sin nature.”
Paul’s term for the old, pre-conversion self tied to Adam and sin.
The expression “old man” appears in Paul’s teaching to describe the believer’s former identity and manner of life under the power of sin, especially in contrast with the “new man” or new self in Christ (notably in Romans 6, Ephesians 4, and Colossians 3). In context, it speaks of the person as belonging to the old order in Adam—corrupted, rebellious, and under judgment—rather than plainly defining a detachable part of human nature. Scripture teaches that believers still struggle against sin, yet it also teaches that in union with Christ the old man has been crucified and decisively put off, forming the basis for holy living. Because some traditions use “old man” almost interchangeably with “sin nature,” a careful dictionary entry should preserve Paul’s own wording and emphasize the safest conclusion: the term refers primarily to the believer’s former self and life under sin, now judged in Christ, while ongoing sanctification involves living consistently with the new self God has given.
Paul uses the “old man”/“new man” contrast to explain the moral and identity change that belongs to union with Christ. In Romans 6, believers are united with Christ in His death and resurrection, so the old self is crucified and sin must no longer reign. In Ephesians 4 and Colossians 3, the language is applied pastorally: believers are told to put off the old way of life, renew their minds, and put on the new self in righteousness and holiness.
In older Christian theology, especially in discussions of sanctification, the phrase “old man” was sometimes treated as shorthand for the believer’s lingering sinful propensity or “sin nature.” While that usage can be pastorally convenient, it can also blur Paul’s emphasis on identity, union with Christ, and transformed conduct. A careful reading keeps the apostolic language primary and avoids making the phrase more technical than the text itself.
Second Temple Jewish thought often distinguished between the old life of sin and a renewed life of covenant faithfulness, though Paul’s wording is distinctly Christ-centered. His contrast of old and new is not merely moral improvement but participation in a new covenant reality through the Messiah. The Adam/Christ framework in Romans especially shapes how the phrase should be read.
The underlying Greek phrase is commonly understood as “old human/person” or “old self” (palaios anthrōpos). The wording points to the former identity and way of life, not to a technical doctrine of an inner substance called a “sin nature.”
The term supports the doctrine of union with Christ and the believer’s change of identity in salvation. The old life has been judged in Christ, so sanctification flows from what God has already done, not from self-reform alone. The phrase also helps distinguish justification and regeneration from the ongoing mortification of sin.
The phrase is best read as covenantal and personal rather than metaphysical. Paul is describing who a person was and how that person lived under Adam’s headship, not dividing the human being into neat inner components. This protects the text from reduction to a simplistic psychology while still acknowledging the reality of inner conflict with sin.
Do not equate “old man” mechanically with the body, personality, or a separate ontological entity. Do not flatten it into a vague label for general weakness. Also avoid making it a technical synonym for “sin nature” if that shorthand obscures Paul’s focus on identity, death to the old order, and the call to new obedience.
Many evangelical interpreters understand the “old man” as the believer’s former self in Adam, now crucified with Christ. Some traditions use the phrase more broadly as a synonym for indwelling sin or sin nature. The first reading best fits Paul’s actual usage and keeps the emphasis on union with Christ and ethical transformation.
The entry affirms that believers still face real temptation and ongoing struggle with sin, but their old identity in Adam has been decisively dealt with in Christ. It does not teach sinless perfection in this life, nor does it reduce sanctification to mere self-effort. The term should be read in harmony with justification by grace and the believer’s new identity in Christ.
Believers are called to “put off” the habits, desires, and patterns of the old life and to “put on” the character of Christ. The doctrine encourages repentance, mortification of sin, and identity-based obedience: Christians live differently because they are no longer the same persons they once were in Adam.