John of Damascus on the image of God
From The Orthodox Faith, chap. 13:
The Son is image of the Father, and image of the Son is the Spirit, through whom the Christ dwelling in man gives it to him to be to the image of God.—John of Damascus, Saint John of Damascus: Writings, trans. Frederic H. Chase, Jr., The Fathers of the Church, Vol. 37 (New York: Fathers of the Church, 1958), 200.
(Restated in better English: The Son is the image of the Father, and the image of the Son is the Spirit, whom Christ, who indwells within humanity, gives to us in order that we might be the image of God.)