When the Invisible One becomes visible to flesh, you may then draw a likeness of His form. When He who is a pure spirit, without form or limit, immeasurable in the boundlessness of His own nature, existing as God, takes upon Himself the form of a servant in substance and in stature, and a body of flesh, then you may draw His likeness, and show it to anyone willing to contemplate it. Depict His ineffable condescension, His virginal birth, His baptism in the Jordan, His transfiguration on Thabor, His all-powerful sufferings, His death and miracles, the proofs of His Godhead, the deeds which He worked in the flesh through divine power, His saving Cross, His Sepulchre, and resurrection, and ascent into heaven. Give to it all the endurance of engraving and color. Have no fear or anxiety; worship is not all of the same kind. Abraham worshipped the sons of Emmor, impious men in ignorance of God, when he bought the double cave for a tomb. (Gen. 23.7; Acts 7.16) Jacob worshipped his brother Esau and Pharaoh, the Egyptian, but on the point of his staff.* (Gen 33.3) He worshipped, he did not adore. Joshua and Daniel worshipped an angel of God; (Jos. 5.14) they did not adore him. The worship of latreia is one thing, and the worship which is given to merit another.
St. John Damascene
Apology Against Those Who Decry Holy Images
Part I