Doctrine in Focus: The Trinity

Nathan Busenitz | May 25, 2016

Why do Christians believe in the doctrine of the Trinity?

Although the term Trinity does not occur in Scripture, the concept is inherently biblical. The Trinitarian nature of God is revealed implicitly in the Old Testament and explicitly in the New Testament.

The doctrine of the Trinity is founded on two fundamental theological realities: (1) There is one true God. (2) The one God has eternally existed as three distinct Persons, each of whom is equally and fully God.

Reality 1: Scripture teaches that there is one true God (cf. Deut. 4:35; 6:4; Isa. 43:10–11; 45:5, 18, 21–22; 46:9; Joel 2:27; Zech. 14:9; Mal. 2:10; Mark 12:29; James 2:19; 1 Tim. 2:5).

Reality 2: Scripture also teaches that God has eternally existed as three distinct Persons, each of whom is equally and fully God.

A. The Father is God (cf. Matt. 6:9, 14; John 17:1–3; 1 Cor. 8:6; 2 Cor. 1:3; Php. 2:11; Col. 1:3; 1 Pet. 1:2).

B. The Son is God (cf. Isaiah 9:6; Matt. 1:23; John 1:1, 14, 18; 20:28; Acts 20:28; Rom. 9:5; 1 Cor. 1:24; 2 Cor. 4:4; Php. 2:6, 10–11; Col. 1:15–16; 2:9; Titus 2:13; Heb. 1:3, 8; 2 Pet. 1:1; 1 John 5:20).

C. The Son is distinct from the Father (Matt. 11:27; John 1:1–2; 3:35; 4:34; 5:30–32, 37; 6:38; 10:36; 12:49; 14:8–11; 17:20–24; Gal. 4:4; 1 John 2:1; Heb. 7:25).

D. The Holy Spirit is God (Gen. 1:2; 6:3; Job 33:4; Psalm 139:7–8; John 3:3–8; 14:23; Acts 5:3–4; 1 Cor. 2:10–11; 6:16,19;  2 Cor. 3:18; Heb. 9:14; 10:15–16; 2 Thess. 2:13; 1 Pet. 1:10–11; 2 Pet. 1:21).

Moreover, the Holy Spirit is a person, possessing the attributes of personhood (Mark 3:29; John 14:26; 16:8; Acts 8:29; 13:2; 16:6; Rom. 8:26; 15:30; 1 Cor. 12:11; Eph. 4:30; 1 Tim. 4:1; Heb. 10:29; Rev. 2:7).

E. The Spirit is distinct from the Father and the Son (Isaiah 48:16; Matt. 28:19; Luke 3:21; John 14:16–17; 26; 16:13–14; Rom. 8:27; Heb. 9:8).

On this basis, the Bible often refers to God in ways that emphasize all three Members of the Trinity (Matt. 28:19; Rom. 14:17–18; 15:13–17; 15:30; 1 Cor. 6:11, 17–19; 12:4–6; 2 Cor. 1:21–22; 3:4–6; 13:14; Gal. 2:21–3:2; Eph. 2:18; 21–22;  3:11–17; 4:4–6; 5:18–20; Php. 2:1, 6; Col. 1:6–8; 1 Thess. 1:1–5; 4:2, 8; 5:18–19; 2 Thess. 2:13, 14; 3:5; Titus 3:4–6; Heb. 9:14; 1 John 3:23–24; Jude 20–21).

Consequently, we embrace the truth of the Trinity because God has revealed Himself in this way in His Word.


Nathan Busenitz avatar
Nathan Busenitz is the dean of faculty and associate professor of theology at The Master's Seminary. He is also one of the pastors of Cornerstone, a fellowship group at Grace Community Church.

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