Definition (house style)
Trinitarian theology is the theological discipline that investigates the Trinity: the doctrine that God is one God in three persons — Father, Son, and Holy Spirit — who equally co-exist and mutually indwell. On apokatastasis.wiki, trinitarian theology is treated primarily through the economic (redemptive-historical) Trinity: how does the Triune God work in salvation? The question of the immanent Trinity (God’s internal relations apart from the economy of redemption) is marginalized or treated only as an implication of the economic Trinity by most of the authors in this corpus.
Author variants
Nee/Lee
Nee and Lee work consistently with an economic trinitarian theology. The structure is: the Father as source is embodied in the Son; the Son as the course is realized in the Spirit as the transmission [EG, Preface]. This three-stage model — source → expression → transmission, analogous to love → grace → fellowship (2Cor. 13:14) — is illuminating but raises acute questions about hypostatic distinction. Lee’s formulation “The Father is not only the Father but also the Son. The Son is not only the Son but also the Spirit” [EG, ch. 1] generates tension with classical modalism. The nine-point confession in BXL1–3 nevertheless articulates the Trinity in classical-orthodox terms: three persons equally co-existing and mutually indwelling from eternity to eternity. The immanent Trinity is virtually absent in Nee and Lee; the Trinity is always the economic Trinity, always directed toward the goal of indwelling.
Jones
Jones treats trinitarian theology through three corresponding ages in God’s economic work: the age of the Father (OT), the age of the Son (NT), and the age of the Holy Spirit (the church). The nine-point confession he uses is classically Trinitarian.
Warnock
Warnock develops a trinitarian theology that centers on the passibility of the Father: the Father suffered together with the Son on the cross (theopaschism). He emphasizes the indwelling of the Father in the Son (John 14:10-11) as the structuring reality of the Trinity, and reads Heb. 9:14 as indicating that the Spirit carried the Blood of Christ — a pneumatological-Trinitarian thesis that is unique in the classical tradition.
Bullinger
Bullinger treats trinitarian theology structurally through the symbolism of the number three: the number of divinity, resurrection, and completeness. His trinitarian theology is numerical-exegetical rather than mystical-ontological.
Noordzij
Noordzij does not work from an explicit trinitarian doctrine but from a Christologically driven trinitarian spirituality: the movement of the Father who sends his Son, and the Spirit who reproduces the life of the Son in believers, is a redemptive-historical framework rather than a systematic trinitarian ontology.