The Bible teaches the Trinty. It took me many years to see it and believe it. The flowing verses changed to mind.
20 But as he was thinking this over, behold, an angel of the Lord appeared to him in a dream, saying, Joseph, descendant of David, do not be afraid to take Mary [as] your wife, for that which is conceived in her is of (from, out of) the Holy Spirit.
Mt 1:20.
19 Go then and make disciples of all the nations, baptizing them into the name of the Father and of the Son and of the Holy Spirit,
Mt 28:19.
14 And the Word (Christ) became flesh (human, incarnate) and tabernacled (fixed His tent of flesh, lived awhile) among us; and we [actually] saw His glory (His honor, His majesty), such glory as an only begotten son receives from his father, full of grace (favor, loving-kindness) and truth.
Jn 1:14.
4 When you read this you can understand my insight into the mystery of Christ
Eph 3:4.
2 [For my concern is] that their hearts may be braced (comforted, cheered, and encouraged) as they are knit together in love, that they may come to have all the abounding wealth and blessings of assured conviction of understanding, and that they may become progressively more intimately acquainted with and may know more definitely and accurately and thoroughly that mystic secret of God, [which is] Christ (the Anointed One).
3 In Him all the treasures of [divine] wisdom (comprehensive insight into the ways and purposes of God) and [all the riches of spiritual] knowledge and enlightenment are stored up and lie hidden.
Col 2:2–3.
14 Since, therefore, [these His] children share in flesh and blood [in the physical nature of human beings], He [Himself] in a similar manner partook of the same [nature], that by [going through] death He might bring to nought and make of no effect him who had the power of death—that is, the devil
Heb 2:14.
It is impossible to believe explicitly in the mystery of Christ without faith in the Trinity, since the mystery of Christ includes that the Son of God took flesh; that He renewed the world through the grace of the Holy Ghost; and again, that He was conceived by the Holy Ghost.… And consequently, when once grace had been revealed, all were bound to explicit faith in the mystery of the Trinity
When we become a Christian, part of the grace of God toward us is the gift of the Holy Spirit. When we receive Christ, we receive the Holy Spirit as well. The Holy Spirit acts like an automatic “sin alarm” system. The things we used to do before we were saved that didn’t bother us at all … now an alarm goes off in us when we even consider doing them. That is the Holy Spirit tweaking us to remind us that we are about to sin against the holiness of God.
When Paul says the Spirit has “poured” the love of God into our hearts, he uses a term that suggests such an abundance that there is not sufficient room to contain it. We don’t just have a little of the love of God by the Spirit, we have love that is overflowing! This, I believe, is the overflow that every new Christian experiences when they first come to know Christ and know the Spirit’s presence.