This is the first of the posts sharing the works of St John of Damascus: On Holy Images. The original text is in three parts, and this is shortly after his introductory passages, asking readers to be kind and remember his aim is to defend the church and icons, rather than seek glory for himself.
Here he sets out not only his completely orthodox belief in the triune God and the incarnation of Christ but shows clearly why it is permissible to show Christ in His human form, as we do in our icons. Having taken flesh – and transfigured it, being both fully human and fully God – we are not worshipping a ‘false god’ or idol.
“I have taken heed to the words of Truth Himself:- “The Lord thy God is one.” (Deut. 6.4) And “Thou shalt fear the Lord thy God, and shalt serve Him only, and thou shalt not have strange, gods.” (Deut. 6.13) Again, “Thou shalt not make to thyself a graven thing, nor the likeness of anything that is in heaven above, or in the earth beneath” (Ex. 20.4); and “Let them be all confounded that adore graven things.” (Ps. 97.7) Again, “The gods that have not made heaven and earth, let them perish.” (Jer. 10.11) In this way God spoke of old to the patriarchs through the prophets, and lastly, through His only-begotten Son, on whose account He made the ages. He says, “This is eternal life, that they may know Thee, the only true God, and Jesus Christ whom Thou didst send.” (Jn 17.3) I believe in one God, the source of all things, without beginning, uncreated, immortal, everlasting, incomprehensible, bodiless, invisible, uncircumscribed,* without form. I believe in one supersubstantial  being, one divine Godhead in three entities, the Father, the Son, and the Holy Ghost, and I adore Him alone with the worship of latreia. I adore one God, one Godhead but three Persons, God the Father, God the Son made flesh, and God the Holy Ghost, one God. I do not adore creation more than the Creator, but I adore the creature created as I am, adopting creation freely and spontaneously that He might elevate our nature and make us partakers of His divine nature. Together with my Lord and King I worship Him clothed in the flesh, not as if it were a garment or He constituted a fourth person of the Trinity–God forbid. 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 (kaq upostasin). 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 (yuch), how much more God who gives breath to the spirit.
Now adversaries say: God’s commands to Moses the law-giver were, “Thou shalt adore shalt worship him the Lord thy God, and thou alone, and thou shalt not make to thyself a graven thing that is in heaven above, or in the earth beneath.”
They err truly, not knowing the Scriptures, for the letter kills whilst the spirit quickens–not finding in the letter the hidden meaning. I could say to these people, with justice, He who taught you this would teach you the following. Listen to the law-giver’s interpretation in Deuteronomy: “And the Lord spoke to you from the midst of the fire. You heard the voice of His words, but you saw not any form at all.” (Deut. 4.12) And shortly afterwards: “Keep your souls carefully. You saw not any similitude in the day that the Lord God spoke to you in Horeb from the midst of the fire, lest perhaps being deceived you might make you a graven similitude, or image of male and female, the similitude of any beasts that are upon the earth, or of birds that fly under heaven.” (Deut. 4.15-17) And again, “Lest, perhaps, lifting up thy eyes to  heaven, thou see the sun and the moon, and all the stars of heaven, and being deceived by error thou adore and serve them.” (Deut. 4.19)
You see the one thing to be aimed at is not to adore a created thing more than the Creator, nor to give the worship of latreia except to Him alone. By worship, consequently, He always understands the worship of latreia. For, again, He says: “Thou shalt not have strange gods other than Me. Thou shalt not make to thyself a graven thing, nor any similitude. Thou shalt not adore them, and thou shalt not serve them, for I am the Lord thy God.” (Deut. 5.7-9) And again, “Overthrow their altars, and break down their statues; burn their groves with fire, and break their idols in pieces. For thou shalt not adore a strange god.” (Deut. 12.3) And a little further on: “Thou shalt not make to thyself gods of metal.” (Ex. 34.17)
You see that He forbids image-making on account of idolatry, and that it is impossible to make an image of the immeasurable, uncircumscribed, invisible God. You have not seen the likeness of Him, the Scripture says, and this was St Paul’s testimony as he stood in the midst of the Areopagus: “Being, therefore,  the offspring of God, we must not suppose the divinity to be like unto gold, or silver, or stone, the graving of art, and device of man.” (Acts 17.29)
It is clear that when you contemplate God, who is a pure spirit, becoming man for your sake, you will be able to clothe Him with the human form. 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 colour. 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 Pharao, the Egyptian, but on the point of his staff.*(Gen 33.3) He worshipped, he did not adore. Josue 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. Now, as we are talking of images and worship, let us analyse the exact meaning of each. An image is a likeness of the original with a certain difference, for it is not an exact reproduction of the original. Thus, the Son is the living, substantial, unchangeable Image of the invisible God (Col. 1.15), bearing in Himself the whole Father, being in all things equal to Him, differing only in being begotten by the Father, who is the Begetter; the Son is begotten. The Father does not proceed from the Son, but the Son from the Father. It is through the Son, though not after Him, that He is what He is, the Father who generates. In God, too, there are representations and images of His future acts,-that is to say, His counsel from all eternity, which is ever unchangeable. That which is divine is immutable; there is no change in Him, nor shadow of change. (James 1.17) Blessed Denis, (the Carthusian [i.e., Pseudo-Dionysius]) who has made divine things in God’s presence his study, says that these representations and images are marked out beforehand. In His counsels, God has noted and settled all that He would do, the unchanging future events before they came to pass. In the same way, a man who wished to  build a house would first make and think out a plan. Again, visible things are images of invisible and intangible things, on which they throw a faint light. Holy Scripture clothes in figure God and the angels, and the same holy man (Blessed Denis) explains why. When sensible things sufficiently render what is beyond sense, and give a form to what is intangible, a medium would be reckoned imperfect according to our standard, if it did not fully represent material vision, or if it required effort of mind. If, therefore, Holy Scripture, providing for our need, ever putting before us what is intangible, clothes it in flesh, does it not make an image of what is thus invested with our nature, and brought to the level of our desires, yet invisible? A certain conception through the senses thus takes place in the brain, which was not there before, and is transmitted to the judicial faculty, and added to the mental store. Gregory, who is so eloquent about God, says that the mind, which is set upon getting beyond corporeal things, is incapable of doing it. For the invisible things of God since the creation of the world are made visible through images. (Rom. 1.20) We see images in  creation which remind us faintly of God, as when, for instance, we speak of the holy and adorable Trinity, imaged by the sun, or light, or burning rays, or by a running fountain, or a full river, or by the mind, speech, or the spirit within us, or by a rose tree, or a sprouting flower, or a sweet fragrance.
Again, an image is expressive of something in the future, mystically shadowing forth what is to happen. For instance, the ark represents the image of Our Lady, Mother of God,* so does the staff and the earthen jar. The serpent brings before us Him who vanquished on the Cross the bite of the original serpent; the sea, water, and the cloud the grace of baptism. (I Cor. 10.1)
Again, things which have taken place are expressed by images for the remembrance either of a wonder, or an honour, or dishonour, or good or evil, to help those who look upon it in after times that we may avoid evils and imitate goodness. It is of two kinds, the written image in books, as when God had the law inscribed on tablets, and when He enjoined that the lives of holy men should be recorded and sensible memorials be preserved in  remembrance; as, for instance, the earthen jar and the staff in the ark. (Ex. 34.28; Heb. 9.4) So now we preserve in writing the images and the good deeds of the past. Either, therefore, take away images altogether and be out of harmony with God, who made these regulations, or receive them with the language and in the manner which befits them. In speaking of the manner let us go into the question of worship.
Worship is the symbol of veneration and of honour. Let us understand that there are different degrees of worship. First of all the worship of latreia, which we show to God, who alone by nature is worthy of worship. When, for the sake of God who is worshipful by nature, we honour His saints and servants, as Josue and Daniel worshipped an angel, and David His holy places, when be says, “Let us go to the place where His feet have stood.” (Ps. 132.7) Again, in His tabernacles, as when all the people of Israel adored in the tent, and standing round the temple in Jerusalem, fixing their gaze upon it from all sides, and worshipping from that day to this, or in the rulers established by Him, as Jacob rendered homage to Esau, his elder brother, (Gen. 33.3) and to Pharaoh, the  divinely established ruler. (Gen. 47.7) Joseph was worshipped by his brothers. (Gen. 50.18) I am aware that worship was based on honour, as in the case of Abraham and the sons of Emmor. (Gen. 23.7) Either, then, do away with worship, or receive it altogether according to its proper measure.”