the Saviour as having indicated this twofold faculty: first, the sustaining power... [Stauros], while in so far as he divides and separates, he is Horos [Limit]... the quaternity and the cross signify wholeness.
Drawing on Gnostic sources and Jung, Edinger argues the cross possesses a dual function — supporting and separating — and that as a quaternary symbol it signifies psychic wholeness.
, The Christian Archetype: A Jungian Commentary on the Life of Christ, 1987thesis