I believe that God exists as a Triune being whose very nature is that of one essence sustaining three persons in perfect relationship—Father, Son, and Holy Spirit. His essence admits of no separation among the three but remains always One. Nevertheless, the three persons remain eternally distinct both in person and in role (Dt 6:4; 1Ch 21:15; Isa 63:9f.; Mk 1:10f.; Mt 28:19)
I believe that within the Trinity, there is an eternal hierarchy of function. The Son is sent by the Father and is submissive to the Father’s will for redemption (Jn 8:28f.). The Spirit is sent from both the Son and the Father to continue the work (Jn16:7f.). The Spirit points people to the Son (Jn 15:26), and the Son is the way to the Father (Jn 14:6). I believe this in no way mitigates the full equality of the members of the Trinity (Jn 10:30; cf. 1Co 15:28).