Everything created from this source is in its own nature suited to be receptive of God not by continuity but by contact. Union comes through contact, not through continuity. What is created is suitable for this contact because it has been created by God in God. Because it has been created in this way, it is an analog; and because of the union, it is like an image of God in a mirror
This is why angels are not angels in their own right but are angels by virtue of their union with the Divine-Human One; and their union depends on their acceptance of what is divinely good and what is divinely true. What is divinely good and what is divinely true are God, and seem to emanate from him even though they are within him. Their acceptance depends on the way angels apply the laws of his design, which are divine truths, to themselves, using their freedom to think and intend according to their reason, a freedom given them by God as their own possession. This is what enables them to accept what is divinely good and divinely true in apparent autonomy; and this in turn is what makes possible the mutual element in their love, for as already noted [§48], love is not real unless it is mutual. It is the same with us here on earth.
All this enables us finally to see that everything in the created universe is a vessel for the divine love and wisdom of the Divine-Human One.
from Divine Love and Wisdom, Sections 56, 57