One sentence, two halves, and a single image doing all the work. Paul has just recoiled from the suggestion that Christ might be an agent of sin (v. 17, μὴ γένοιτο). Verse 18 gives the reason, and it does so by turning the charge around: the man who would actually be found a transgressor is not the one who left the law behind, but the one who puts it back up.

Three features carry the verse.

The building metaphor is live. κατέλυσα is the verb for pulling down a house or dismantling a wall; οἰκοδομῶ is the verb for putting one up. The pair is a fixed antithesis in biblical Greek, and the aspects are not interchangeable: the demolition is an accomplished act (aorist), the rebuilding is in progress (present). The sentence pictures a man standing in his own rubble, laying courses again.

The grammar is forensic. συνιστάνω with a double accusative is the language of producing something before a tribunal — commending a person, presenting credentials, establishing a case. With ἐμαυτόν as the object, the man is his own exhibit and his own prosecution witness. Nobody convicts him; he mounts the evidence himself.

The referents are withheld. Paul does not say what was torn down, and he does not say who ‘I’ is. The first person is almost certainly rhetorical — he is still speaking to Cephas and through him to the Galatians (v. 14) — and the thing demolished is contested between the law as a system of standing, the wall between Jew and Gentile, and the particular practice of table fellowship that had just been dismantled at Antioch and was being rebuilt. The rendering must leave all three standing.

What the verse does not say is also worth noting: Paul does not call the rebuilder a sinner (ἁμαρτωλός, the word of vv. 15 and 17) but a παραβάτης, one who has stepped over a marked line — which is a law-word, and therefore the sharpest possible answer to a charge made on the law’s behalf.

Proposed — pending reviewHans Dieter Betz, Galatians: A Commentary on Paul's Letter to the Churches in Galatia, Hermeneia (Philadelphia: Fortress, 1979)

γάρ grounds what precedes. The question is what precedes: the μὴ γένοιτο of v. 17, or the whole of v. 17, or (on a minority reading) a suppressed step between them. Epistolary connectives are load-bearing (§10) and the particle is rendered in every tier; its scope is recorded, not resolved.

εἰ + present indicative is a first-class condition. Per standing policy the protasis is entertained as real for the sake of argument, but Paul chose the conditional form and ‘since’ is excluded — it closes the gap the conditional leaves for the hearer to fill, and here the hearer is being invited to recognize himself in it or not.

::: contested[Whose ‘I’?] The first-person verbs are the crux of the verse’s application.

Rhetorical / representative. The ἐγώ is a figure — Paul speaking as any Jewish believer, or specifically as Cephas, whose conduct at Antioch (vv. 11-14) consisted precisely of dismantling and then reinstating a separation. On this reading v. 18 is a delicately indirect indictment, and the first person is courtesy. Chrysostom reads it this way: Paul transfers the charge to himself to spare Peter.

Autobiographical. Paul means himself, either of the possibility he refuses (he will not rebuild) or of a position he has in fact abandoned once for all.

Gnomic. The ἐγώ is the indefinite ‘one’ of a maxim, as frequently in diatribe (cf. Rom 7:7-25, where the same question recurs and is equally disputed).

The rendering keeps the plain first person and supplies no marker in any direction. Nothing in the Greek distinguishes these, and every paraphrase (‘if a man rebuilds’, ‘if you rebuild’) adjudicates. :::

ἃ κατέλυσα ταῦτα πάλιν οἰκοδομῶ is a casus pendens: a relative clause fronted as topic and then resumed by a demonstrative in the main clause. Good Koine with LXX colouring, and the construction is already fixed in this corpus (Phil 3:7 ἅτινα … ταῦτα).

Two features must survive into English:

1. The fronting. The object comes first. The sentence suspends what the speaker is doing until the reader has been shown what it is being done to.
2. The resumptive pronoun. Attic would find ταῦτα redundant; Koine does not, and it bears emphasis — ‘these very things’. Deleting it (‘if I rebuild what I tore down’) produces smoother English at the cost of the hammer-blow.

The literal tier keeps the order and the pronoun woodenly; smooth registers may render the pronoun as ‘the very things’.

The neuter plural ἅ has no expressed antecedent, and this is where the exegetical weight sits.

::: contested[What was torn down?] The law as a way of standing before God. The dominant reading: Paul demolished reliance on ἔργα νόμου (v. 16), and to rebuild it is to re-erect the very structure under which one stands condemned. Supported by the immediate argument of vv. 15-21 and by v. 21’s οὐκ ἀθετῶ τὴν χάριν.

The dividing wall between Jew and Gentile. The referent is the separation that Antioch’s common table had abolished and that Cephas’s withdrawal (v. 12) was rebuilding. The building metaphor is strikingly close to Eph 2:14-15 (τὸ μεσότοιχον … λύσας), and the narrative frame of vv. 11-14 is the nearest context.

The practice of table fellowship, concretely. The nearest thing actually demolished in the chapter is the custom barring Jews from eating with Gentiles; what Cephas rebuilt was that. This reading makes v. 18 almost a direct description of the Antioch episode.

These are not mutually exclusive — the second and third are facets of one act — but they are not the same claim either. The rendering supplies no antecedent in any tier. :::

Proposed — pending reviewF. F. Bruce, The Epistle to the Galatians: A Commentary on the Greek Text, NIGTC (Grand Rapids: Eerdmans, 1982)

καταλύω is κατά + λύω: to loose down, hence to demolish. Its primary objects in biblical Greek are buildings — the temple above all (Mark 13:2; 14:58; 15:29; Acts 6:14) — and the sense is the undoing of a standing structure. It also extends to abolishing a law or institution (Matt 5:17, καταλῦσαι τὸν νόμον; 2 Macc 2:22), which is precisely why it is the right verb for a sentence that is about both.

οἰκοδομέω is its fixed counterpart (οἶκος + δέμω, ‘build a house’). The pairing καταλύω / οἰκοδομέω is formulaic: Jer 1:10 LXX sets καθαιρεῖν and οἰκοδομεῖν as the prophet’s twin commissions, and the demolish-and-rebuild temple charge against Jesus runs on exactly these two verbs. A reader of Greek would hear the pair as a unit.

Glossary decision. Both verbs keep their construction-domain English (§8 — live metaphor retained). Excluded from the reading text: ‘destroy’ for καταλύω (too final; the point is that the rubble is still there to be relaid), ‘abolish’ and ‘set aside’ (abstract the structure away, and the second belongs to ἀθετέω, which Paul uses three verses later at v. 21), and ‘re-establish’ or ‘reinstate’ for οἰκοδομέω (dissolve the image into institutional language).

The aspects are not decorative. κατέλυσα is a complexive aorist: one completed act, viewed whole. οἰκοδομῶ is a durative present: masonry going up as the sentence is spoken. Levelling both to simple pasts (‘if I rebuilt what I destroyed’) erases the asymmetry on which the sentence depends — the demolition is behind the speaker, the rebuilding is what he is caught doing.

πάλιν stands between the object and the verb. Per standing policy the adverb is rendered in its Greek slot and not relocated for smoothness; with ταῦτα immediately before it, the effect is a stack of pointing words — these, again — before the verb lands.

παρά + βαίνω: one who steps across. The English ‘transgressor’ (trans + gradior) is an exact calque, which is why it is retained — it keeps the boundary-crossing image live in a verse built entirely on physical imagery.

The noun presupposes a specific standard overstepped. Rom 4:15 makes this explicit (οὗ δὲ οὐκ ἔστιν νόμος, οὐδὲ παράβασις), and Rom 2:25, 27 pairs παραβάτης νόμου with circumcision in a way that is directly relevant here. Jas 2:9, 11 uses it of one convicted by the law. The word is therefore not a general term of moral disapproval but a law-term: it names a verdict reached by reference to a named standard.

This is why the word choice matters. Verses 15 and 17 use ἁμαρτωλός (‘sinner’) — the word the Jewish side of the argument applies to Gentiles and the word v. 17’s objection throws back at those justified in Christ. Verse 18 switches to παραβάτης. The rhetorical move is exact: the man who objects that abandoning the law makes one a sinner is told that the real line-crossing is on his side, and he is told it in law-vocabulary. Rendering both words ‘sinner’ destroys the whole argumentative point.

Glossary decision. ‘Transgressor’ in every tier. Excluded: ‘lawbreaker’ (the compound duplicates the νόμος implied by the noun and discards the image), ‘sinner’ (collapses into ἁμαρτωλός — see above), ‘offender’ (drops the boundary). Keep audibly distinct from παράπτωμα (‘trespass, false step’, a stumble off the path) and from ἀδικία (‘unrighteousness’).

The noun is anarthrous and qualitative — a transgressor, of that character — and stands first in its clause, before the reflexive pronoun and the verb. Preserve the fronting where English permits.

σύν + ἵστημι: to set together, hence to present, produce, establish. In Paul it is near-technical for putting something forward so that it can be assessed — commending a person (Rom 16:1; 2 Cor 3:1; 4:2; 6:4; 10:18) or demonstrating a case (Rom 3:5; 5:8; 2 Cor 7:11). The register is forensic and evidential: one produces a commendation or an exhibit.

With a double accusative — object ἐμαυτόν, predicate παραβάτην — the construction assigns a standing, not merely an opinion. The corpus already fixes this for ἡγέομαι (Phil 2:6) and ἔχω (Phil 2:29); the same discipline applies here. Both accusatives stay visible in the literal tier with the supplied copula bracketed.

The reflexive is the sting. No judge appears in the sentence. The man builds, and by building he mounts the evidence against himself. ‘I prove myself a transgressor’ is acceptable in modern registers; ‘I make myself a transgressor’ (following the Vulgate’s praevaricatorem me constituo) is retained in liturgical register but risks a different claim — that the rebuilding constitutes the offense rather than demonstrating it.

::: contested[Demonstrate, or constitute?] Demonstrative (‘prove, show myself to be’). The dominant Pauline sense of συνίστημι, and the forensic register of the double accusative. On this reading the man already stands on the wrong side of the line and the rebuilding merely exhibits the fact.

Constitutive (‘make, set up as’). ἵστημι-compounds can mean ‘appoint, establish’ (cf. καθίστημι), and the building metaphor in the same sentence pulls that way: the man erects his own status as he erects the wall.

The difference matters for what the verse says about Cephas: on the first reading his conduct reveals an existing condition; on the second it creates one. ‘Establish myself as’ and ‘present myself as’ are both hospitable to the two readings; a flat ‘prove’ or a flat ‘make’ adjudicates. The reading text uses ‘establish’, which in English carries both the evidential and the constructive sense — and which keeps the ἵστημι root audible against the building vocabulary. :::

Morphology. συνιστάνω is the late Koine thematic form of συνίστημι (cf. ἱστάνω for ἵστημι), with no semantic difference. It is recorded, not rendered differently.

Proposed — pending reviewRichard N. Longenecker, Galatians, Word Biblical Commentary 41 (Dallas: Word, 1990)

The verse is textually quiet. NA28 prints it without a bracket and with no variant worth a sign in the apparatus; UBS5 does not rate it.

The only wobbles are morphological and orthographic. The form συνιστάνω (the Koine thematic present) is replaced in part of the later tradition by the classicizing συνίστημι, and a few witnesses read συνιστῶ. These are normalizations toward literary Greek and carry no semantic weight; the harder late-Koine form is to be retained and the variation recorded rather than rendered.

The word order ταῦτα πάλιν οἰκοδομῶ is stable. Where ancient copyists do intervene elsewhere in this chapter they tend to smooth syntax (cf. the fluctuation at v. 4-5), which makes the undisturbed casus pendens here good evidence that the construction was felt as idiomatic rather than awkward.

Vulgate: si enim quae destruxi haec iterum aedifico, praevaricatorem me constituo. Jerome keeps the fronted relative and the resumptive haec exactly, which is a useful check on whether the Greek construction is awkward — Latin reproduces it without strain. Destruxi is slightly stronger than κατέλυσα (closer to ‘demolished utterly’), and constituo commits to the constitutive reading of συνιστάνω noted above. Praevaricator is a courtroom word in Latin — originally of collusive prosecution, then of one who oversteps — and so preserves the forensic register of παραβάτης better than the English ‘transgressor’ now does.

Peshitta renders the pair of verbs with the ordinary Syriac demolish/build antithesis, keeping the construction metaphor intact, and uses an ‘I show myself’ construction for the apodosis, which leans demonstrative where the Latin leans constitutive. The two versions thus divide on exactly the point the Greek leaves open — which is itself a piece of evidence that the ambiguity is in the text and not in modern readers.

Neither version can mark the aorist/present aspect contrast of κατέλυσα / οἰκοδομῶ as sharply as Greek does; the Latin perfect and present come closest. English can and should.

Chrysostom (Homilies on Galatians, ad loc.) takes the first person as a courtesy: Paul shifts the charge onto himself to avoid naming Peter a second time, and the things torn down are the observances whose abolition the gospel accomplished. He is emphatic that the ‘transgressor’ is the rebuilder — the offense lies not in having left the law but in going back.

Augustine, in his commentary on Galatians, reads the demolition as the dismantling of confidence in the law and the rebuilding as a return to it, and he presses the point against those who would require observance of Gentile believers. His handling of συνιστάνω is demonstrative rather than constitutive: the rebuilder shows what he is.

Jerome’s commentary on the verse worries at the ‘I’ in much the same way modern readers do, and canvasses both the representative and the autobiographical construals without settling.

What the Fathers hold in common — and it is a useful control — is that none of them reads v. 18 as a statement about the law being bad. The verse is about going back, and the fault it names is the fault of reconstruction.

Proposed — pending reviewJohn Chrysostom, Commentary on the Epistle to the Galatians, in Nicene and Post-Nicene Fathers, First Series, vol. 13 (Edinburgh: T&T Clark, repr. 1989) · Jerome, Commentary on Galatians, trans. Andrew Cain, Fathers of the Church 121 (Washington, DC: Catholic University of America Press, 2010) · Eric Plumer, Augustine's Commentary on Galatians: Introduction, Text, Translation, and Notes, Oxford Early Christian Studies (Oxford: Oxford University Press, 2003)

Verses 15-21 are the speech begun at v. 14 — whether the quotation ends at v. 14, v. 16, or v. 21 is an old question, and the quotation marks in printed editions are editorial throughout. Verse 18 sits at the hinge.

The sequence runs: a shared premise (vv. 15-16, that justification is not ἐξ ἔργων νόμου), an objection drawn from it (v. 17, does that make Christ a servant of sin?), the recoil (μὴ γένοιτο), and then the counter-argument — v. 18, introduced by γάρ. The counter-argument does not defend the position against the charge of producing sinners; it relocates the charge. Transgression lies with reconstruction.

What follows unpacks it in the first person and without metaphor: ἐγὼ γὰρ διὰ νόμου νόμῳ ἀπέθανον (v. 19). The man who died to the law cannot rebuild what he died out of without making his own death a transgression — which is why v. 21 can close by saying that if righteousness comes through law, Christ died δωρεάν, for nothing.

The building image also looks backward. The only thing in this chapter that has demonstrably been torn down and then put back up is the separation at Antioch: Cephas ate μετὰ τῶν ἐθνῶν and then ὑπέστελλεν καὶ ἀφώριζεν ἑαυτόν (v. 12). Whether Paul intends that specific referent or a wider one is the contested question treated above, but the narrative sets the terms.

Proposed — pending reviewJ. Louis Martyn, Galatians: A New Translation with Introduction and Commentary, Anchor Bible 33A (New York: Doubleday, 1997)