“The Trinity is the basis of the gospel, and the gospel is a declaration of the Trinity in action.”
This is glorious! In a very real sense our salvation is trinitarian. Of course, this in no way diminishes the fact that Jesus saves, that he is Savior. But rather, grounded in the Covenant of Redemption, the Father chooses his own (Eph 1:3-6), the Son atones for their sins (Eph 1:7-12), and the Holy Spirit regenerates us (Jn 3:1-21; Titus 3:5-7) , unites us to Christ (1Jn 4:13; 1Co 6:15, 19; 12:13; Ro 6:3-4; Gal 3:27; R0 8:9-10), indwells us (1Co 6:19), seals us for eternity (Eph 1:13-14; 4:30), and sanctifies us (initially – 1Co 6:11; progressively – 2Th 2:13; finally – 1Th 5:23). And, union with Christ by the Spirit really results in our union with the whole of the Trinity (Jn 14-17; Ro 8:16), as well as, union with one another (Ro 12:5). So, the gospel is based upon the reality and covenanted plan of the three persons of the Godhead. To proclaim the gospel is to speak of the work of the Trinity. To experience the gospel is to enter into gracious, saving trinitarian reality.
Rejoice, beloved! Our salvation is far more astoundingly deep and penetrating than we dared imagine.