That flesh is divine, and endures after its assumption. Human nature was not lost in the Godhead, but just as the Word made flesh remained the Word, so flesh became the Word remaining flesh, becoming, rather, one with the Word through union. Therefore I venture to draw an image of the invisible God, not as invisible, but as having become visible for our sakes through flesh and blood. I do not draw an image of the immortal Godhead. I paint the visible flesh of God, for it is impossible to represent a spirit, how much more God who gives breath to the spirit.
St. John Damascene
Apology Against Those Who Decry Holy Images
Part I