"If we attempted to make an image of the invisible God, this would be sinful indeed. It is impossible to portray one who is without body: invisible, uncircumscribed, and without form. Again, if we made images of men and believed them to be gods, and adored them as if they were so, we would be truly impious. We do neither of these things. But we are not mistaken if we make images of God incarnate, who was seen on earth in the flesh, associated with men, and in His unspeakable goodness assumed the nature, feeling, form, and color of our flesh. For we yearn to see how He looked as the apostle says, 'Now we see through a glass darkly.' Now the icon is also a dark glass, fashioned according to the limitations of our physical nature. Though the mind wear itself out with effort, it can never cast away its bodily nature,"
St. John of Damascus.