Triune

Christians believe in a triune God, meaning that he is three hypostases in perfect unity.

The entire member seems a dense webbed bed of welded sinews; but cut into it, and you find that three distinct strata compose it:—upper, middle, and lower. […]. This triune structure, as much as anything else, imparts power to the tail.

1990, Mary Ann Fatula, The Triune God of Christian Faith, Liturgical Press (Michael Glazier Books), page 21, To be Christian today thus means reflective and critical fidelity to the essential elements of our Christian heritage in scripture and tradition, yet in a way that enables us to respond to the ever new presence of the triune God active in our own experience and world.

2003, Jeffrey C. Pugh, Entertaining the Triune Mystery, Continuum International Publishing Group (Trinity Press International), page 80, Because the triune God is seen in ways that reflect relationality, God's presence can be expressed in the world in such a way that gnostic separation of the world and God should not be allowed to be a central part of Christian belief.

And in a double movement, the descent of the eternal Son is the Triune God's movement to initiate and enable reconciliation decisively with humanity, which is then followed by the ascent of the human Christ to continue the enabled relationship with the Triune God.