One short clause, and almost every word in it is doing more work than its size suggests.

Paul has just conceded something (v. 15): if any of the “mature” are minded otherwise on some point, God will disclose it to them. πλήν then clamps the concession down — only, whatever remains to be revealed, here is what is not up for negotiation. What is not negotiable is εἰς ὃ ἐφθάσαμεν — the ground already reached — and the command is τῷ αὐτῷ στοιχεῖν, to keep in step by that same thing.

Three features shape the rendering:

1. στοιχέω is a marching/ranking verb, not a generic verb of conduct. Paul had περιπατέω available (he uses it in vv. 17–18) and did not use it. The image of a column holding its line should survive into English.
2. The clause has no finite verb. The infinitive carries imperatival force — a construction familiar from Hellenistic decrees and papyri, and rare enough in Paul that it registers as clipped, almost formulaic: a marching order rather than an exhortation.
3. τῷ αὐτῷ has an elided head noun. Rule? Path? Mind? Greek does not say, and later scribes tried to say it for Paul (see the textual note). The apparatus keeps the gap open and brackets the supplied word.

The verse is the hinge between Paul’s autobiography (vv. 4–14) and the imitation-appeal (v. 17): do not regress from what has already been attained, and stay in formation together while you advance.

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Already fixed in the glossary at Phil 1:18: πλήν cuts off a line of discussion and states the one thing that survives it (BDF §449). The same logic operates here, and the parallel is worth noticing — at 1:18 Paul dismisses the motives of rival preachers (“only — in every way Christ is proclaimed”); here he dismisses the residual disagreements of the mature (“only — as far as we have come, keep in step”).

Rendering it “nevertheless” (so the Vulgate’s verumtamen) keeps the adversative and drops the restriction. Rendering it “the important thing is” imports approval Paul does not state. Only carries both the adversative turn and the narrowing, and it is short enough to preserve the clipped register of the Greek.

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In classical Greek φθάνω means to get there first, anticipate, forestall — and Paul retains that sense at 1 Thess 4:15 (οὐ μὴ φθάσωμεν, “we shall certainly not precede”). By the Koine period the priority component has largely bleached out, leaving simply arrive at, reach, attain. That is the sense at Matt 12:28 / Luke 11:20 (ἔφθασεν ἐφʼ ὑμᾶς ἡ βασιλεία), Rom 9:31, and 2 Cor 10:14, and it is the sense required here: no one is being outrun.

The aorist is complexive — the whole distance covered up to now, viewed as one accomplished stretch. English present perfect (“we have arrived at,” “we have come”) reads it naturally from the standpoint of the writing.

Note the deliberate tension with vv. 12–13: Paul has just denied that he has taken hold (ἔλαβον, κατειληφέναι) of the prize. Here he affirms that there is nevertheless real ground reached (ἐφθάσαμεν). Not yet arrived at the τέλος; genuinely arrived somewhere. Both must stand, and the English should not soften either — “attained” in the sense of finished attainment would flatly contradict v. 12.

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The relative ὅ has no expressed antecedent; it is neuter singular and internally headed — “[that point] unto which we arrived.” Greek tolerates this readily; English needs a supplied noun or a paraphrase (“as far as we have come”).

The first-person plural is significant. Paul does not say “as far as you have come.” He puts himself inside the column with them, exactly as at v. 15 (φρονῶμεν) and against the second-person imperatives that surround the passage (βλέπετε v. 2, γίνεσθε v. 17). The correction is issued from inside the ranks.

On scope: εἰς ὅ is best taken with what follows (the standard by which to march is the ground already gained), not as a loose adverbial appended to πλήν. The fronting of the prepositional phrase before the infinitive is topicalizing — Paul names the shared ground first, then gives the order. Preserve the order in English.

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στοιχέω derives from στοῖχος, a row or file — of soldiers, of vines, of columns in a building. The verb means to stand in a row, to hold rank, to march in file, hence figuratively to conform to a line laid down. It appears five times in the NT, all in Paul or Acts about Paul: Acts 21:24; Rom 4:12; Gal 5:25; 6:16; Phil 3:16.

Two of those are decisive for the sense here. Gal 6:16 — ὅσοι τῷ κανόνι τούτῳ στοιχήσουσιν, “as many as will keep in step by this rule” — supplies a dative of the same shape as our τῷ αὐτῷ, with the head noun expressed (κανών, a measuring-rod, hence a standard). Gal 5:25 — πνεύματι στοιχῶμεν — is a hortatory subjunctive in a context of communal friction, precisely parallel in function to Phil 3:16.

Crucially, Paul writes περιπατέω for generic “walk, conduct oneself” — including twice in the very next two verses (περιπατοῦντας v. 17, περιπατοῦσιν v. 18). The switch to στοιχέω here is a lexical choice, not a stylistic variation, and the corporate/military connotation should not be sanded off. Set beside συναθλέω (1:27), the athletic ἀγών (1:30), and the footrace of 3:13–14, the ordered-ranks image belongs to a sustained register in this letter.

The present infinitive is durative: continuous alignment, not a single act of falling in.

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Two questions, both open.

(a) What noun is elided? Grammatically the article + αὐτῷ can stand alone (“the same”), with the reader supplying the head from context. Candidates:

• κανών (rule/standard) — the Gal 6:16 parallel is exact in construction, and a scribal tradition supplied precisely this word here (see the textual note). The dative would then be a dative of rule.
• the neuter τοῦτο of v. 15 — “this same mindset,” tying στοιχεῖν back to φρονῶμεν.
• the ὅ of the preceding clause — “the same [point already reached]”: what has been attained is itself the line to hold.
• σκοπός / the path of vv. 13–14 — the same track, the same aim.

On balance the third and first converge: the ground already gained functions as the standard. But Paul left it unspecified and the English should not close it. Hence the bracketed supply — “by the same [rule]” — with the brackets doing real work.

(b) What kind of dative? Either a dative of rule/norm (“by, in accordance with the same”) or a dative of accompaniment/association (“together in the same,” stressing that they march with one another). Gal 6:16’s κανόνι and Gal 5:25’s πνεύματι favor the norm reading, which is adopted. The associative shading is not thereby excluded, and given Philippians’ pervasive concern with corporate unity (2:2; 4:2) it is likely audible.

Note that ὁ αὐτός in attributive position is the identity-adjective (“the same”), already fixed at Phil 1:30 (τὸν αὐτὸν ἀγῶνα) — not the intensive predicate use (“himself”). Do not soften to “a similar.”

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The clause has no finite verb. στοιχεῖν is a bare infinitive functioning as a command — the infinitivus pro imperativo (BDF §389). It is common in Hellenistic decrees, official letters, and papyri instructions, and appears in the NT at Rom 12:15 (χαίρειν … κλαίειν) and, in some analyses, Phil 3:16.

Three accounts are in play:

1. Imperatival infinitive. Standalone command: “keep in step!” Explains the absence of any governing verb and matches the clipped, decree-like register.
2. Hortatory, borrowing from v. 15. The infinitive depends loosely on the φρονῶμεν of v. 15, hence “let us keep in step.” This preserves the first-person inclusiveness of ἐφθάσαμεν, which sits oddly beside a second-person command.
3. Ellipsis of δεῖ or the like. “[It is necessary] to keep in step.”

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The short text — πλὴν εἰς ὃ ἐφθάσαμεν, τῷ αὐτῷ στοιχεῖν — is read by 𝔓⁴⁶ 𝔓⁶¹ ℵ* A B Ι 33 1739 and the Coptic and Ethiopic versions, and is printed without brackets in NA28.

A substantial group of later witnesses expands it. Two supplements circulated, sometimes together:

• κανόνι after τῷ αὐτῷ (“by the same rule”) — ℵ² D² Ψ and the Byzantine mass, plus the Latin and Syriac traditions.
• φρονεῖν appended (“to be of the same mind, to keep in step”) — a further Byzantine addition.

Both are secondary, and the mechanism is transparent. κανόνι is a harmonization to Gal 6:16 (τῷ κανόνι τούτῳ στοιχήσουσιν), where the noun is expressed; a scribe finding τῷ αὐτῷ bare naturally filled the gap from the nearest Pauline parallel. φρονεῖν is an assimilation to the φρονῶμεν / φρονεῖτε of v. 15 immediately above.

The internal criteria all point the same way: the shorter reading explains the longer, the longer readings are each explicable as clarifications of a genuine difficulty, and the difficulty itself (an elided head noun) is exactly what scribes remove rather than create. Metzger’s committee rated the omission of the additions as effectively certain.

Doctrinally nothing turns on it — but exegetically something does. The scribes who wrote κανόνι resolved the very ambiguity discussed above, and a translation that supplies “rule” without brackets reproduces the Byzantine reading rather than the critical text. Hence the brackets in the literal tier.

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The Vulgate reads verumtamen ad quod pervenimus ut idem sapiamus — three decisions visible at once. Verumtamen renders πλήν adversatively and loses the restrictive narrowing. Pervenimus is a good equivalent for ἐφθάσαμεν (arrival, without priority). But ut idem sapiamus translates the expanded Greek text with φρονεῖν, not στοιχεῖν — Jerome’s base text had the assimilated reading, and sapiamus (“let us be of the same mind”) accordingly loses the marching image altogether. It also converts the infinitive into a purpose clause.

The Peshitta likewise reflects a fuller text. Both version traditions therefore stand on the Byzantine side of the textual question and cannot be used as independent support for a “rule”/“mind” supplement.

This is a useful case for the principle in §VII.2 of the guiding document: a translation made from a secondary version here would inherit both a textual expansion and a lost metaphor.

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Chrysostom (Hom. in Phil. 11–12) reads the verse as a pastoral concession followed by a floor. On v. 15 he takes Paul as declining to press a doubtful point; on v. 16 he has Paul say in effect: whatever is still under discussion, do not lose the ground you stand on. His emphasis falls on the corporate dimension — the ranks are not to break while the argument continues.

Theodoret glosses στοιχεῖν with the sense of holding to the same order (τάξις), which is precisely the στοῖχος image, and reads τῷ αὐτῷ of the shared apostolic teaching already received.

Ambrosiaster, working from a Latin text with sapiamus, unsurprisingly reads the verse as about unity of mind rather than unity of walk — a good illustration of how the textual variant redirected Western exegesis.

What the Greek Fathers uniformly do not find here is a doctrine of graded attainment or perfectionism. They read a floor, not a ceiling: v. 12 denies arrival, v. 16 forbids retreat.

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The discourse shape of vv. 15–17 is worth setting out, because v. 16 is the pivot:

• v. 15a — ὅσοι οὖν τέλειοι, τοῦτο φρονῶμεν: hortatory subjunctive, first plural, addressed to the “mature.”
• v. 15b — καὶ εἴ τι ἑτέρως φρονεῖτε …: concession. Some hold a different view on some point; God will disclose it.
• v. 16 — πλήν …: the concession is bounded. Revelation may add; it may not subtract from ground already held.
• v. 17 — Συμμιμηταί μου γίνεσθε: second-person imperative, the positive model supplied.

Per §10, epistolary connectives are load-bearing and must be rendered. Dropping πλήν (as smooth translations are tempted to do, since English dislikes a one-word clause-opener here) destroys the boundary function and makes v. 16 read as a bland addendum instead of a limit clause. Keep it in initial position.

Note too the ὅσοι … πλήν … structure: Paul concedes breadth of opinion among the mature but not breadth of practice. The disagreement he tolerates is at the level of φρονεῖν; the unity he requires is at the level of στοιχεῖν.

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The verse guards a distinction that is easily lost in both directions.

Against perfectionism: v. 16 does not concede any arrival. ἐφθάσαμεν names distance covered, not the finish line; v. 12’s οὐχ … ἤδη τετελείωμαι stands unrevoked. The ὅσοι τέλειοι of v. 15 is therefore relative — mature, not completed — and v. 16 is what keeps the two verses from contradicting.

Against quietism: the command is not merely to hold still. στοιχέω in a chapter dominated by pursuit (διώκω, vv. 12, 14), stretching forward (ἐπεκτεινόμενος, v. 13), and a prize (βραβεῖον, v. 14) is the discipline of a moving column, not a stationary one. Keeping in step is how the advance is made without the ranks scattering.

And against individualism: the first-person plural and the corporate verb both refuse to let progress be a private matter. Philippians has a named fracture (4:2) and a whole vocabulary of σύν-compounds built to address it (σύμψυχοι 2:2, συναθλέω 1:27, συμμιμηταί in the very next verse). v. 16 belongs to that campaign. Whatever remains unclear, the column holds its line together.

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