Richard Bauckham, in God Crucified: Monotheism and Christology in the New Testament:
The divine identity is known in the radical contrast and conjunction of exaltation and humiliation--as the God who is Creator of all things, and no less truly God in the human life of Jesus; as the God who is Sovereign over all things, and no less truly God in Jesus' obedience and service; as the God of transcendent majesty who is no less truly God in the abject humiliation of the cross. These are not contradictions because God is self-giving love, as much in his creation and rule of all things as in his human incarnation and death. (pg. 68)UPDATE: Fixed title from "Humilty" to "Humility." Heh, "humility" indeed!