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Onesimus — the One Man an Entire Letter of the New Testament Was Written For

Of the New Testament’s twenty-seven books, exactly one is devoted entirely to the situation of a single individual. The person that entire book is about is Onesimus.

What the text actually says

Paul writes to Philemon from prison. Philemon was a leader in the Colossian church and Onesimus’s owner. The text doesn’t spell out every detail, but the widely accepted reconstruction is that Onesimus fled from Philemon — possibly having stolen something, which verse 18-19’s “If he has wronged you in any way or owes you anything, charge it to me” seems to hint at — and met Paul in prison, where he became a Christian.

Paul sends Onesimus back to Philemon along with this letter. Its language is carefully calibrated: “I appeal to you for my son Onesimus, who became my son while I was in chains… Formerly he was useless to you, but now he has become useful both to you and to me… welcome him as you would welcome me… no longer as a slave, but better than a slave, as a dear brother… How much dearer, then, to you both as a fellow man and as a brother in the Lord” (Philemon 10-11, 17, 16). Paul admits he wanted to keep Onesimus with him (v. 13), but says he won’t do so without Philemon’s consent (v. 14). He closes with, “Confident of your obedience, I write to you, knowing that you will do even more than I ask” (v. 21) — ending without a direct order, but leaving an unmistakable expectation.

Demanding without commanding

N. T. Wright, in his Colossians and Philemon commentary (Tyndale NT Commentaries), calls this one of the most rhetorically sophisticated documents in the Pauline corpus. Paul could have commanded as an apostle — “although in Christ I could be bold and order you to do what you ought to do” (v. 8) — but instead chooses to appeal to love (v. 9). Yet within that gentle language lies a clear direction. Douglas J. Moo, in his Letters to the Colossians and to Philemon commentary (Pillar NTC), argues that the moment Paul asks Philemon to receive Onesimus “no longer as a slave… but as a dear brother,” he is, in effect, requesting a relationship fundamentally incompatible with slavery itself. Paul doesn’t declare the abolition of slavery outright, but he chooses language that undermines the institution’s theological foundation from within.

Why he didn’t command it directly

This has been long debated: why didn’t Paul explicitly condemn slavery? John M. G. Barclay, in his essay on Philemon and the dilemma of Christian slave-ownership, argues that Paul’s strategy wasn’t a frontal attack on the institution, but a redefinition, in Christ, of the relationship between the two people caught within it — master and slave — making the institution itself, in practice, unsustainable. This wasn’t a declaration of immediate social reform, but a strategy of letting the gospel work from the deepest layer of a human relationship outward.

A clue about what happened to Onesimus

Colossians 4:9 mentions Onesimus again: “He is coming with Onesimus, our faithful and dear brother, who is one of you.” Being described again as a “faithful and dear brother” strongly suggests that Philemon accepted Paul’s request.

The “Onesimus” Ignatius met

The story arguably goes a step further from here. Ignatius of Antioch, being transported to Rome for execution around A.D. 110, writes to the Ephesian church and names their bishop as “Onesimus,” praising him as “a man of inexpressible love” (Epistle to the Ephesians 1). If this early dating is accepted, and if this bishop is the same Onesimus from Philemon, his life would trace an arc from slave to brother to, finally, the bishop leading an entire local church. That identification can’t be confirmed with certainty — but at minimum, Ignatius’s letter shows that “Onesimus” was, in fact, the name of a genuinely respected leader in the Ephesian church in the early second century.

A note for preachers

Onesimus isn’t remembered for a dramatic ministry or a famous sermon — he’s remembered as a case where the gospel upended a single person’s entire social status. This passage shows that the gospel isn’t confined to abstract doctrine; it’s concrete and radical enough to rewrite the actual social language of “slave” and “brother.”

Sources

  • N. T. Wright, Colossians and Philemon (Tyndale New Testament Commentaries, IVP Academic, 1986)
  • Douglas J. Moo, The Letters to the Colossians and to Philemon (Pillar New Testament Commentary, Eerdmans, 2008)
  • John M. G. Barclay, “Paul, Philemon and the Dilemma of Christian Slave-Ownership,” New Testament Studies 37 (1991)
  • Ignatius of Antioch, Epistle to the Ephesians 1 (c. 110)

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