Ephesians 4:4–6

Verse 4: "There is one body and one Spirit, even as you also were called in one hope of your calling."

Paul opens with an ecclesiological claim inseparable from a pneumatological one: the one body is the Church, which he has already identified in Ephesians 1:23 as "the fullness of him who fills everything in every way." This is not a voluntary association or a loose spiritual fellowship — it is the Body of Christ, organically united to its Head (Col. 1:18). The coupling of "one body" with "one Spirit" is deliberately indissoluble: the body is not a social reality animated by human effort, but a living organism enlivened by the Holy Spirit, who is its soul. Augustine would later capture this precisely: "What the soul is to the human body, the Holy Spirit is to the Body of Christ, which is the Church" (Sermon 267). The one hope completes the verse's forward motion: the body lives in the Spirit and strains toward a common eschatological horizon. The Greek elpis (hope) here is not vague optimism but confident expectation grounded in the Resurrection. All members are "called" (klēsis) — a word Paul uses for God's sovereign, effective vocation — toward the same inheritance (Eph. 1:18). Unity is therefore not just present but also future-oriented: the Church is a pilgrim people sharing one destination.

Verse 5: "One Lord, one faith, one baptism."

This triad moves to the explicitly Christological and sacramental. One Lord (Greek: heis Kyrios) echoes the Shema of Deuteronomy 6:4 — the foundational Jewish confession of divine oneness — now applied to Jesus Christ (cf. 1 Cor. 8:6, where Paul splits the Shema between the Father and the Son). For a mixed Jewish-Gentile community in Ephesus, this is a radical leveling: there is no second-tier lord for the Gentiles, no ethnic privilege for Jewish believers. One faith refers here primarily not to the subjective act of believing, but to the fides quae creditur — the objective deposit of faith, the shared doctrinal content entrusted to the Church (cf. Jude 3: "the faith once for all delivered to the saints"). It is the common confession that admits no private variation. One baptism is the most concrete and visible of the three: the single sacramental door through which all enter the Body. Paul's insistence on "one" baptism (against any repetition or plurality) echoes Romans 6:3–4, where baptism is a once-for-all dying and rising with Christ. Cyril of Jerusalem, in his Mystagogical Catecheses, taught that baptism is the irreversible seal of the Spirit, linking it directly to the "one Spirit" of verse 4.

Verse 6: "One God and Father of all, who is over all and through all and in us all."

The sevenfold unity reaches its summit in the Father — the arche, the first principle and source of all. The three-fold "all" (epi pantōn, dia pantōn, en pasin) — over all, through all, in all — describes the Father's transcendence, mediation, and immanence in a single breath. He is over all in sovereign majesty, through all as the source and sustainer of every good, and in all as the one who dwells within his people by grace. Thomas Aquinas, commenting on this passage, noted that these three prepositions map onto the classical understanding of God's causality: efficient, exemplary, and final. The "all" (pas) is not pantheistic universality but refers throughout to the members of the one body — the Father is not distributed across the cosmos abstractly, but dwells within his covenant family in a particular, personal way. This verse also implicitly frames the entire sevenfold list as Trinitarian: the Spirit (v.4), the Lord/Son (v.5), and the Father (v.6) are the divine ground of each dimension of unity.