Part I
We Believe in One God
A. The One God
6. Christians believe that âthe One true God,â who made himself known to Israel, has revealed himself supremely in the âone whom he has sent,â namely Jesus Christ (John 17:3); that, in Christ, God has reconciled the world to himself (2 Cor. 5:19); and that, by his Holy Spirit, God brings new and eternal life to all who through Christ put their trust in him.
7. This faith in a single, universal God who is Creator, Redeemer, and Sustainer of everything is challenged by those who doubt whether there is any reality beyond the visible world, providing the source of its being and continuing life: for them a conception of God is no more than an expression and projection of human wishes and fears. Even when it is acknowledged that there are powers transcending the visible reality of the world the question is, can it be maintained that there is only one such power and should that power be conceived as purely transcendent or also as immanent in the world, and how can these aspects be reconciled?
8. Many who agree with Christians in a belief in one God find the Trinitarian affirmation of Christians difficult to understand. For Jews and Muslims particularly, the Christian concept of the Triune God has been a stumbling block because it seems to deny monotheism. There are also Christians today who consider that the Christian doctrine of the Trinity at the very least requires fresh interpretation and even linguistic revision. Moreover, there is widespread neglect and misunderstanding of the doctrine. It is sometimes explained âmodalistically,â as if it meant that God is really one, but because of human limitations is understood in three different ways, or âtri-theistically,â as though worship of God the Father, God the Son, and God the Holy Spirit were three separable and different kinds of worship. Many feel that the traditional Trinitarian teaching is too speculative in comparison with the biblical language about God the Father, the Son, and the Holy Spirit. Such challenges ask for contemporary work of clarification.
I. The Creed and Its Biblical Witness
a) The Text of the Creed
9. âWe believe in one God.â
(AC: âI believe in God.â)
10. The Nicene Creed begins with confessing belief in one God. The theme of the oneness of God is in turn expanded in the three articles of the Creed in a Trinitarian way. The first article stresses belief in One God, the Father; the second, in One Lord, the Son of the Father; and the third, in the Holy Spirit, the Lord, who proceeds from the Father. Thus, the One God is understood in terms of the Father, the Son, and the Holy Spirit, the Father being the source of all divinity. Corresponding to the oneness of the Triune God, the Creed affirms that there is also only one Church and one baptism (cf. Eph. 4:4â6). Thus the Creed emphasizes oneness in all the three articles.
b) Biblical Witness
11. In the course of its history Israel came to believe in the uniqueness of God. This finds its classical expression in the âShema Israelâ: âHear, O Israel, the LORD is our God, the LORD alone. You shall love the LORD your God with all your heart, and with all your soul, and with all your mightâ (Deut. 6:4f.). It is most emphatically expounded in the prophecies of Second Isaiah where the LORD the Creator and Redeemer, is confessed explicitly as the only God, not only for Israel, but for all peoples. Other gods are mere idols: âAnd there is no other god besides me, a righteous God and a Saviour; there is none besides me. Turn to me and be saved, all the ends of the earth! For I am God, and there is no otherâ (Isa. 45:21â22).
12. The Old Testament emphasis on the uniqueness of God was continued in the New Testament. Jesus affirmed the faith of Israel concerning the one God. He dismissed Satan by citing the Scriptures: âYou shall worship the LORD your God, and him only shall you serveâ (Matt. 4:10; cf. Deut 6:13). He endorsed the âHear, O Israelâ as the first and great commandment and the way to eternal life (Mark 12:29; Matt. 22:37; Luke 10:27).
13. However, the New Testament also makes clear that this God is in a unique relationship with Jesus Christ. Jesus is called his son (Luke 1:32â33; Mark 1:11 parallels). Jesus addresses this God as âFatherâ, using the intimate word âAbbaâ (Mark 14:36). Jesus is the Fatherâs own beloved and only Son (John 1:18; 3:16; Rom. 8:32; Col. 1:13). Whoever has seen the Son has seen the Father (John 14:9), for the Father and the Son are âoneâ (John 10:30; 17:11). While remaining distinct, the Father and the Son âdwellâ in each other (John 17:21).
14. At the same time the New Testament also links the Spiritââwho proceeds from the Fatherâ (John 15â26)âwith the Son (cf. para. 210). According to the prayer of Christ, the Father sends the Holy Spirit into the world, âthe other Paraclete,â the Spirit who âmakes aliveâ and guides into all the truth (John 16:7). All three, Father, Son, and Holy Spirit, are named together in the early apostolic preaching and writing (2 Cor. 13:13; Eph. 4:4â6).
II. Explication for Today
The One God: Father, Son, and Spirit
15. The particularity of Christian faith in the one God is based on the revelation of Father, Son, and Holy Spirit. Therefore, the divine economy, the history of salvation in creation, reconciliation, and eschatological fulfilment, is the basis of the Trinitarian faith. On the one hand, the One God is in all eternity the Father, the Son, and the Holy Spirit. Economic and eternal Trinity is but one reality. The two aspects are inseparable from each other. This unity of economic and eternal Trinity has not always been duly taken into consideration. But it is only on the basis of the historical revelation of God in Jesus Christ that the Trinitarian faith of the church can be accounted for. The Trinitarian doctrine is not a product of abstract speculation, but a summary of how God is revealed in Jesus Christ.
16. It is in the divine economy that the separation and alienation of the world from God as a result of sin and evil is overcome through the reconciling work of the Son and the transfiguring presence of the Spirit. In the mystery of this divine economy of salvation the one God is revealed as life and love communicating himself to his creatures. God the Father reconciles the world to himself through the incarnation, the ministry, and the suffering of his eternal Son. In the Son God shares the human condition even to death, in order to offer to humanity forgiveness of sin, resurrection, and eternal life (John 3:16). Through the Spirit God raised the crucified one to a new and imperishable life that will bring about the final transfiguration and glorification of our lives and of the whole creation in the eschatological future. By the proclamation of this good news the Spirit even now kindles faith, love, and hope in the hearts of those who receive the gospel, as even before the incarnation of the Son he encouraged the hope for the future salvation of humanity.
17. The incarnate Son reveals that in Godâs eternal glory, before all time and history, his divine life is mutual self-giving and communion, that âGod is loveâ (1 John 4:8). This eternal love and communion between Father and Son is revealed in the cross of Christ and in his resurrection through the power of the Spirit. Cross and resurrection cannot be understood apart from the Trinitarian communion of Father, Son, and Spirit, nor can the Trinity be understood apart from the cross and the resurrection. The cross is the affirmation of a love which is stronger than sin and death, and the resurrection confirms that this divine love is indeed and will be victorious.
18. The eternal source of that living Trinitarian communion of love is God the Father. But the Father was never without the Son, nor was he ever without his Spirit. The mutual indwelling of the three persons is the seal of their unity. Godâs eternal life and glory is in the free giving of the persons in mutual communion to each other. The divine unity originates from the Father as its source, but is maintained in the obedience of the Son and in the testimony of the Spirit glorifying the Son in the Father and the Father in the Son.
19. The Church believes in this eternal communion of love, as it is revealed and actualized in the divine economy: it is at work in the creation of the world as well as in its redemption and in its sanctification and ultimate glorification. Although the work of creation is attributed specifically to the Father, the work of redemption to the Son, and the work of sanctification and glorification to the Spirit, the work of each of the Trinitarian persons implies the presence and co-operation of all three. Thus, God is one. None of the three persons of the Trinity has a life of his own apart from the ot...