Gregory of Nazianzus on the Theophany of the Incarnation:

For God was manifested to man by birth.  On the one hand Being, and eternally Being, of the Eternal Being, above cause and word, for there was no word before The Word; and on the other hand for our sakes also Becoming, that He Who gives us our being might also give us our Well-being, or rather might restore us by His Incarnation, when we had by wickedness fallen from wellbeing (Oration 39, On Theophany, or Birthday of Christ, III).