Even if a unity of faith is not possible, a unity of love is.
Whoever removes the Cross and its interpretation by the New Testament from the center, in order to replace it, for example, with the social commitment of Jesus to the oppressed as a new center, no longer stands in continuity with the apostolic faith.
The Christian response is contained in these two fundamental dogmas: that of the Trinity and that of the Incarnation. In the trinitarian dogma God is one, good, true, and beautiful because he is essentially Love, and Love supposes the one, the other, and their unity.
The inner reality of love can be recognized only by love.
Thus it is necessary to commence from an inescapable duality: the finite is not the infinite.