(a) The Father is not God as such; for God is not only Father, but also Son and Holy Spirit. The term “Father” designates that hypostatical distinction in the divine nature in virtue of which God is related to the Son, and through the Son and the Spirit to the church and the world. As author of the believer's spiritual as well as natural life, God is doubly his Father; but this relation which God sustains to creatures is not the ground of the title. God is Father primarily in virtue of the relation which he sustains to the eternal Son; only as we are spiritually united to Jesus Christ do we become children of God.
(b) The Son is not God as such; for God is not only Son, but also Father and Holy Spirit. “The Son” designates that distinction in virtue of which God is related to the Father, is sent by the Father to redeem the world, and with the Father sends the Holy Spirit.
(c) The Holy Spirit is not God as such; for God is not only Holy Spirit, but also Father and Son. “The Holy Spirit” designates that distinction in virtue of which God is related to the Father and the Son, and is sent by them to accomplish the work of renewing the ungodly and of sanctifying the church.
Neither of these names designates the Monad as such. Each designates rather that personal distinction which forms the eternal basis and ground for a particular self-revelation. In the sense of being the Author and Provider of men's natural life, God is the Father of all. But even this natural sonship is mediated by Jesus Christ; see 1 Cor. 8:6—“one Lord, Jesus Christ through whom are all things, and we through him.” The phrase “Our Father,”however, can be used with the highest truth only by the regenerate, who have been newly born of God by being united to Christ through the power of the Holy Spirit. See Gal. 3:26—“For ye are all sons of God, through faith, in Jesus Christ”; 4:4-6—“God sent forth his Son ... that we might receive the adoption of sons ... sent forth the Spirit of his Son into our hearts, crying, Abba, Father”; Eph. 1:5—“foreordained as unto adoption as sons through Jesus Christ.” God's love for Christ is the measure of his love for those who are one with Christ. Human nature in Christ is lifted up into the life and communion of the eternal Trinity. Shedd, Dogm. Theol., 1:306-310.
Human fatherhood is a reflection of the divine, not, vice versa, the divine a reflection of the human; cf. Eph. 3:14, 15—“the Father, from whom every fatherhood πατριά in heaven and on earth is named.” Chadwick, Unitarianism, 77-83, makes the name “Father” only a symbol for the great Cause of organic evolution, the Author of all being. But we may reply with Stearns, Evidence of Christian Experience, 177—“to know God outside of the sphere of redemption is not to know him in the deeper meaning of the term ‘Father’. It is only through the Son that we know the Father: Mat. 11:27—‘Neither doth any know the Father, save the Son, and he to whomsoever the Son willeth to reveal him.’”
Whiton, Gloria Patri, 38—“The Unseen can be known only by the seen which comes forth from it. The all-generating or Paternal Life which is hidden from us can be known only by the generated or Filial Life in which it reveals itself. The goodness and righteousness which inhabits eternity can be known only by the goodness and righteousness which issues from it in the successive births of time. God above the world is made known only by God in the world. God transcendent, the Father, is revealed by God immanent, the Son.” Faber: “O marvellous, O worshipful! No song or sound is heard, But everywhere and every hour, In love, in wisdom and in power, [pg 335]the Father speaks his dear eternal Word.” We may interpret this as meaning that self-expression is a necessity of nature to an infinite Mind. The Word is therefore eternal. Christ is the mirror from which are flashed upon us the rays of the hidden Luminary. So Principal Fairbairn says: “Theology must be on its historical side Christocentric, but on its doctrinal side Theocentric.”
Salmond, Expositor's Greek Testament, on Eph. 1:5—“By ‘adoption’ Paul does not mean the bestowal of the full privileges of the family on those who are sons by nature, but the acceptance into the family of those who are not sons originally and by right in the relation proper of those who are sons by birth. Hence υἱοθεσία is never affirmed of Christ, for he alone is Son of God by nature. So Paul regards our sonship, not as lying in the natural relation in which men stand to God as his children, but as implying a new relation of grace, founded on a covenant relation of God and on the work of Christ (Gal. 4:5 sq.).”
2. Qualified sense of these titles.
Like the word “person”, the names Father, Son, and Holy Spirit are not to be confined within the precise limitations of meaning which would be required if they were applied to men.