Verse 6 is the second half of a matched pair. In v. 4 God sent forth his Son; in v. 6 God sent forth the Spirit of his Son — the same verb (ἐξαπέστειλεν), the same subject, the same aorist. The result of the first sending is legal status (υἱοθεσία, v. 5); the result of the second is the experienced consciousness of that status, audible in a cry.

Four things carry the weight:

1. ὅτι is causal, not evidential. Sonship is not proved by the Spirit’s presence; the Spirit is given because sonship is already conferred. The order is not negotiable in Paul’s argument, and it is the whole answer to the Galatian error.
2. τὸ πνεῦμα τοῦ υἱοῦ αὐτοῦ is unique in the NT. Paul could have written ‘the Holy Spirit’ and did not. The Spirit is identified by relation to the Son so that the Son’s own relation to the Father becomes the shape of ours.
3. The Spirit is the one crying. κρᾶζον is neuter, agreeing with πνεῦμα, not with the sons. Rom 8:15 has believers crying; here the Spirit does. Paul does not harmonize the two, and neither should a translation.
4. Αββα ὁ πατήρ preserves an Aramaic word inside a Greek letter to Greek-speaking Gentiles, glossed on the spot. That the gloss was needed and yet the Aramaic was kept tells you the phrase was fixed liturgical speech before Paul wrote it.

The person-shift (‘you are sons’ … ‘our hearts’) is deliberate and should not be smoothed.

ὅτι at the head of the clause is causal — ‘because you are sons.’ The alternative construal, taking it as ‘that’ dependent on some verb of proof (‘the proof that you are sons is that God sent…’), requires supplying a governing expression the Greek does not have, and inverts the logic Paul has just built: adoption is secured by the Son’s redemptive mission (vv. 4-5), and the Spirit follows on it.

δέ is continuative here, not adversative. It moves the argument one step on rather than setting v. 6 against v. 5. Per §10 it is rendered, not dropped: ‘And.’

The present indicative ἐστε is worth noting against the aorists that follow. The status is a standing present fact; the sendings are completed acts. Paul is not saying ‘so that you may become sons’ — the Galatians are sons, and the whole letter’s pastoral force depends on their being told so in the indicative before anything is asked of them.

Built onbdag · bdf · na28

The verse begins in the second plural (ἐστε, ‘you are’) and ends in the first plural (ἡμῶν, ‘our hearts’). Verse 5 had ‘we might receive’; v. 7 drops to the second singular (‘you are no longer a slave’). The oscillation is not carelessness.

The most economical reading: Paul states the status of his Gentile readers directly (‘you are sons’ — the point in dispute at Galatia), then includes himself in the experience of the Spirit’s cry (‘our hearts’), because that experience is common ground between Jewish and Gentile believers and therefore evidence he can appeal to without argument. The rhetorical move is: your status, our shared experience.

A translation must keep both pronouns as written. Levelling to ‘your hearts’ reproduces a scribal correction (see the textual note) rather than the text.

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ἐξαπέστειλεν repeats verbatim the main verb of v. 4. The double compound (ἐξ + ἀπό + στέλλω) is abundant in the LXX for commissioned sending out — of messengers, of angels, of Israel from Egypt — and the ἐκ- element gives a sense of dispatch from the sender’s presence.

Whether the prefix here implies pre-existence (sent out from beside God) is genuinely disputed, and the same dispute governs v. 4. What is not disputed is that Paul chose one verb for both sendings and thereby set the Spirit’s mission in exact parallel with the Son’s. English must use the same word at both verses or the parallel becomes invisible.

‘Sent forth’ in the literal tier keeps the compound audible; ‘sent out’ in smooth registers. Avoid ‘gave’ (which is δίδωμι, Paul’s word at 1 Thess 4:8 and Rom 5:5) and avoid ‘poured out’ (ἐκχέω, Acts 2:17; Titus 3:6) — Paul had both available.

Built onbdag · muraoka-lxx · bdf

This exact phrase occurs nowhere else in the NT. Paul writes ‘the Spirit of Christ’ (Rom 8:9), ‘the Spirit of Jesus Christ’ (Phil 1:19), ‘the Spirit of God’ (Rom 8:9, 14), ‘the Holy Spirit’ constantly. Here, and only here, ‘the Spirit of his Son.’

The reason is structural. The paragraph turns entirely on υἱός: God’s Son sent (v. 4), so that we receive υἱοθεσία (v. 5), because you are υἱοί (v. 6a), so God sent the Spirit of his υἱός (v. 6b), so you are no longer a slave but a υἱός (v. 7). The Spirit is named in the terms of the argument, so that the Spirit who animates the adopted sons is identified as the Son’s own Spirit. What the Son has by nature, the sons receive by gift — and the medium of the gift is the Son’s Spirit crying the Son’s own address to the Father.

The genitive is not resolved to an adjective. ‘His Son’s Spirit’ or ‘the Spirit of sonship’ (as though the genitive were qualitative) both close a question the Greek leaves open: possessive (the Spirit belonging to the Son), source (the Spirit sent by the Son), and characterizing (the Spirit who makes sons) are all live, and the bare ‘of’ construction holds them.

Built onbdag · obrien-nigtc · hurtado-ljc · bauckham-god-crucified

εἰς + accusative is directional. The Spirit is sent into the hearts, not merely placed in them; ἐν + dative was available. English ‘into’ keeps the motion.

καρδία is the LXX equivalent of lēb / lēbāb — the seat of thought, will, and commitment, not primarily the emotions (glossary policy, fixed elsewhere in this corpus). Paul is not describing a feeling. The claim is that the Spirit has been dispatched into the deliberative centre of the person, which is why the cry that follows is a genuine act of the whole self and not a mood.

The plural καρδίας with the plural possessive distributes: each has a heart, and the Spirit is in each. Compare 2 Cor 1:22 and Rom 5:5 for the same locating of the Spirit’s arrival.

κράζω is a loud cry. In the LXX it renders זָעַק/צָעַק and is the standard verb for the cry of the oppressed to God (Exod 2:23; Judg 3:9; Ps 21:6 LXX) and for the psalmist’s urgent prayer (Ps 3:5; 21:3, 25 LXX). In the Gospels it is the shout of demons, of crowds, of the blind man who will not be quieted (Mark 10:47-48).

The register matters. Paul did not write λέγον (‘saying’) or λαλοῦν (‘speaking’). ‘Crying out’ is the right English; ‘saying’ flattens it and ‘whispering’ or ‘breathing’ inverts it. Whether the setting is corporate worship — the assembly’s cry aloud — or the individual’s inarticulate urgency is not stated, but the verb belongs to the register of prayer under pressure, which suits a letter written to communities being told their standing before God is deficient.

Note the grammatical subject. κρᾶζον is a neuter singular participle. Its only possible antecedent in the sentence is τὸ πνεῦμα. The Spirit cries.

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Αββα transliterates Aramaic אַבָּא — the determined/emphatic form of אָב, ‘the father,’ used in Aramaic of the period both as a definite noun and as direct address. It is not a diminutive, and it is not baby-talk.

The once-popular claim that Abba is the lisping ‘Daddy’ of a small child, and that Jesus’ use of it was therefore an unprecedented intimacy, does not survive the evidence. The form appears in Targumic and later Jewish Aramaic as the ordinary adult word for one’s father, including in legal and formal contexts. It is warm and familial — the address of a son to his father within the household — but the ‘Daddy’ gloss overstates it and has been widely withdrawn in the scholarship. Per §9, a rendering must follow the period-appropriate sense: ‘Abba’ retained as a transliterated term, glossed as ‘Father.’

ὁ πατήρ is nominative in form but vocative in function. Nominative-for-vocative with the article is regular Koine, calqued on Semitic usage and abundant in the LXX (e.g. Ps 21:2 LXX; Mark 5:41; Matt 11:26). It is therefore not evidence that Paul is making a statement rather than an address. The literal tier keeps ‘[the] Father’ bracketed to show the article; the smooth tier renders it as address.

Why both words? Three explanations, not mutually exclusive:

• ὁ πατήρ is Paul’s translation for readers who did not know Aramaic (his usual habit: cf. Mark 5:41; 15:34, and the glossing in Gal 4:25).
• The two-word form was already a fixed bilingual liturgical formula in the mixed Jewish-Gentile assemblies, and Paul cites it as a unit — which explains its identical appearance at Rom 8:15 and its presence at Mark 14:36.
• The doubling is itself emphatic, in the manner of a cry.

The convergence of Mark 14:36 (Gethsemane), Rom 8:15, and Gal 4:6 — three independent contexts, the same Aramaic word, twice with the same Greek gloss — is strong evidence that this is dominical language taken over into the church’s prayer. The Spirit of the Son cries what the Son cried.

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υἱοί must not be rendered ‘children.’ Paul uses τέκνα for children (and does so in this very chapter, vv. 19, 25, 27, 28, 31), and the switch is deliberate. In vv. 1-7 the argument runs on Greco-Roman inheritance law: the κληρονόμος (v. 1), the ἐπίτροποι and οἰκονόμοι (v. 2), the προθεσμία (v. 2), υἱοθεσία (v. 5), and the conclusion οὐκέτι δοῦλος ἀλλὰ υἱός … καὶ κληρονόμος (v. 7). The word is doing legal work: the υἱός is the heir, over against the δοῦλος.

Per §3 the masculine plural stands as written. The referent at Galatia was certainly mixed-sex — Paul’s own Gal 3:28 says so four verses earlier — and that is precisely why the masculine must be retained: the point is that all believers, women included, receive the legal standing of the son and heir, a standing which in the surrounding culture women largely did not hold. Neutralizing to ‘children’ removes both the legal category and the scandal.

Built onbdag · obrien-nigtc

Three points of variation, all traceable to the difficulties the verse creates for a copyist.

1. ἡμῶν / ὑμῶν (‘our hearts’ / ‘your hearts’). The reading ἡμῶν is supported by the earliest and most weighty witnesses and is printed in NA28/UBS5. ὑμῶν appears in a substantial body of later witnesses and some versions, and is easily explained: the scribe, having just written ἐστε (‘you are sons’), levels the pronoun to match. Itacism (η and υ having converged in pronunciation) makes the confusion mechanically easy in dictation as well. The harder, unlevelled ἡμῶν is original, and the person-shift it creates is Paul’s.

2. κρᾶζον / κράζοντος / κραζόντων. The neuter κρᾶζον, agreeing with πνεῦμα, is the critical text. Some witnesses read the masculine/neuter genitive singular κράζοντος (agreeing with υἱοῦ, or construed as a genitive absolute), and a few the genitive plural κραζόντων (making believers the subject, harmonizing to Rom 8:15). Both are secondary attempts to relieve the same difficulty flagged above: it is theologically striking to have the Spirit as the crier. The variants are themselves evidence that ancient readers felt the force of κρᾶζον.

3. Word order and the article. Minor transpositions in the phrase ὁ θεὸς τὸ πνεῦμα and occasional omission of the article before πατήρ occur; neither affects sense, and the omission of the article is a normalization toward ordinary Greek vocative usage.

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Chrysostom, commenting on Galatians, takes the verse as proof that adoption is prior to the Spirit’s gift and not earned by it: God gives the Spirit because they are already sons. He also reads the Spirit’s cry as the Spirit speaking in and through the believer, harmonizing Gal 4:6 with Rom 8:15, and stresses the boldness (παρρησία) of the address — that slaves do not speak to a master this way.

The Greek Fathers regularly cited τὸ πνεῦμα τοῦ υἱοῦ αὐτοῦ in trinitarian argument, as evidence that the Spirit belongs essentially to the Son and not merely functionally. Latin writers later folded the phrase into the filioque discussion. Both developments are reception (§9, §11): they may be named, but they carry no weight in deciding the rendering, which keeps the bare genitive.

What the patristic reading does supply is cultural confirmation on two fronts. First, that Αββα ὁ πατήρ was heard as liturgical address, not as a doctrinal statement — the Fathers assume it is prayer. Second, that the honour/status contrast between δοῦλος and υἱός was immediately legible in a Greco-Roman world where the difference between a slave and an heir in the same household was the difference between property and person.

Built onobrien-nigtc · hurtado-ljc

The paragraph is a tight chiasm of sending and status, and v. 6 sits at its hinge:

• v. 4 God sent forth his Son — born of a woman, under law
• v. 5 purpose: to redeem those under law, purpose: that we might receive adoption as sons
• v. 6a ground: because you are sons
• v. 6b God sent forth the Spirit of his Son — into our hearts, crying ‘Abba, Father’
• v. 7 result: no longer a slave but a son; and if a son, then heir

Two sendings, one verb. The first establishes the status; the second makes it heard. The Spirit does not create the sonship — v. 6a forbids that reading — but the Spirit is how the sonship becomes audible, in a cry the Son himself uttered.

Against the Galatian teachers this is decisive: they were urging law-observance (v. 10 lists the calendar) as the route to full standing. Paul’s answer is that the Spirit’s presence in the assembly’s own prayer already certifies a standing that law-observance could only obscure. The argument is from experience the readers cannot deny to a conclusion they are being pressed to abandon.

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