One more quote from James Torrance:
The Trinitarian view of worship is that it is the gift of participating through the Spirit in the incarnate Son’s communion with the Father. That means participating in union with Christ, in what he has done for us once and for all, in his self-offering to the Father, in his life and death on the cross. It also means participation in what he is continuing to do for us in the presence of the Father and in his mission from the Father to the world. There is only one true Priest through whom and with whom we draw near to God our Father. There is only one Mediator between God and humanity. There is only one offering which is truly acceptable to God, and it is not ours. It is the offering by which he has sanctified for all time those who come to God by him (Heb. 2:11; 10:10, 14).