So the ironic thing about the Trinity is that it beholds the mystery of who God is. Since we only know in part and not in full as Apostle Paul tells us, we do not know fully the mystery because who can know fully God?
The part which we do know though, our Lord revealed Himself and His Name to Moses. The Great “I Am Who I Am” or the Tetragrammaton יהוה or YHWH which is the unspeakable Name. Because of fear of the Lord, Israelites reverently refer to His Name as Adonai instead or “LORD.” This Lord who is our God tells us through His Prophet Isaiah that He will give us a Son, Immanuel which means “God among us.” This Son is who the Prophets of Scripture spoke of and who the disciples of Christ testified to us as Lord, who “before Abraham, I Am.”
And being that there is only One Lord and God the Father, “The LORD your God” says that we shall worhsip no one else but Him, therefore by Him exalting Jesus Christ as the “Name above all names” and that everyone “confess that Jesus Christ is LORD” is to the glory of the Father. And thus, the testament that His Holy Spirit gives is True that if we see the Son then we have seen the Father. For the Father and Son are One. They have coexisted eternally as One, “In the beginning was the Word, and the Word was with God, and the Word was God…And the Word became flesh and made His dwelling among us.”
And it is this Oneness that Christ calls His Church, His Body, to have. Both with each other and with Him whom our Spirit belongs. His Holy Spirit is the Love that connects the Father and the Son and it is this very same Spirit that Christ gives to us to live in us and through us by His very Spirit.
This perfect form of Love which is unbounded and can not be broken as it is the perfect unity and Oneness of God, is the Father, Son, and Holy Spirit who are co-eternal, consubstantial, and co-essential to the One being of our Infinite God who can not be contained by Heaven nor Earth, and His Holy Trinity is the limited personhood by which He has revealed to us for us to know Him by.