Blessed Anastasius, Archbishop of Theopolis, on the Sabbath, to Simeon, Bishop of Bostris.
On Holy Images — translated by Mary H. Allies
As in the king’s absence his image is honoured instead of himself, so in his presence it would be unseemly to leave the original for the image. This is not to say that what is passed over in his presence should be dishonoured. … As the man who shows disrespect to the king’s image is punished as if he had shown it to the king in very deed, although the image is composed merely of wood and paint moulded together, so one who shows disrespect to the likeness of a man means it for the original of the likeness.
Translated by Mary H. Allies. Edition opa.patristics.john-of-damascus.on-holy-images.en.