The taxis of God — one essence, three persons, in and over all
Scripture confesses one God in three persons. "Hear, Israel: Yahweh is our God. Yahweh is one." (Deuteronomy 6:4 — the Shema). And yet the same canon names the Father, the Son, and the Holy Spirit as distinct, each fully God, in a single divine name: "baptizing them in the name of the Father and of the Son and of the Holy Spirit," (Matthew 28:19 — singular name, three persons). The apostolic blessing names all three together: "The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all." (2 Corinthians 13:14).
The Father and Son are distinct yet one in essence:
"I and the Father are one.”." — John 10:30
"has seen me has seen the Father." — John 14:9
The Spirit is sent by the Father at the request of the Son, and proceeds from the Father:
"I will pray to the Father, and he will give you another Counselor, that he may be with you forever: the Spirit of truth,." — John 14:16–17
"“When the Counselor has come, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, he will testify about me." — John 15:26
Plural pronouns appear at creation itself: "make man in our image, after our likeness." (Genesis 1:26).
The classical vocabulary
The Church developed precise Greek terms in the first four centuries to hold what scripture confesses without collapsing it. The vocabulary is not above scripture; it is a fence around it, preventing distortion.
| Term | Meaning |
|---|---|
| Ousia (οὐσία) | Substance, essence, being. One ousia in God. |
| Hypostasis (ὑπόστασις) | Person, individuated subsistence. Three hypostases — Father, Son, Spirit. |
| Homoousios (ὁμοούσιος) | Of the same substance. Affirmed at the Council of Nicaea (325 AD). The Son is not merely similar to the Father in substance (homoiousios, the heretical one-iota variant); the Son is of the same substance. |
| Perichoresis (περιχώρησις) | Mutual indwelling. Each person is fully present in the others; not stacked, partitioned, or sequenced — interpenetrating. |
| Taxis (τάξις) | Order of relations. Father unbegotten; Son eternally begotten of the Father; Spirit eternally proceeding from the Father. Order of relations, not hierarchy of essence. The three are coequal in being; their relations are ordered. |
Immanent and economic
Two further classical distinctions are useful for reading scripture cleanly:
- Immanent Trinity — the Trinity as God is in himself, eternally. The internal life of God before any creation exists. The Father eternally loves the Son (John 17:24); the Spirit eternally proceeds.
- Economic Trinity — the Trinity as revealed in the oikonomia, the economy of salvation. Father initiates and sends; Son executes and mediates; Spirit applies and indwells. Same God; three operations visible across the salvation-arc.
Transcendent and immanent — in and through all, but not identical with all
Scripture holds two truths about God's relation to creation:
"For the high and lofty One who inhabits eternity, whose name is Holy, says: “I dwell in the high and holy place, with him also who is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite." — Isaiah 57:15 (both at once — transcendent and immanent)
"in him we live, move, and have our being." — Acts 17:28 (immanent)
"Yahweh says: Heaven is my throne, and the earth is my footstool. What kind of house will you build to me? Where will I rest? For my hand has made all these things, and so all these things came to be, says Yahweh." — Isaiah 66:1–2 (transcendent — the cosmos is at his command, but does not contain him)
"one God and Father of all, who is over all and through all and in us all." — Ephesians 4:6 (above, through, in — three relations at once)
So God is in and through everything (immanence) and above and beyond everything (transcendence) and indwells those who receive him (Spirit-given indwelling), but God is not identical with anything created. The maker holds the made; the maker is not the made. This distinguishes Christian classical theism from pantheism (God = the universe) and from panentheism (universe in God, God exceeds the universe — modern formulation that softens the Creator/creature distinction). The historic Christian position keeps the maker and the made distinct while affirming the maker's pervasive sustaining presence in the made.
"For of him and through him and to him are all things. To him be the glory for ever! Amen." — Romans 11:36
See: Deuteronomy 6:4; Matthew 28:19; 2 Corinthians 13:14; John 1:1–18; John 10:30; John 14:9–17, 26; John 15:26; John 17; Genesis 1:1–2, 26; Colossians 1:15–20; Hebrews 1:1–3; Acts 17:24–28; Isaiah 57:15; Isaiah 66:1–2; Ephesians 4:6; Romans 11:33–36; 1 Corinthians 8:6.