There are many unwritten traditions that are handed down

The eye-witnesses and ministers of the word handed down the teaching of the Church, not only by writing, but also by unwritten tradition. Whence comes our knowledge of the sacred spot, Mount Calvary, of the holy sepulchre? Has it not been handed down to us from father to son? It is written that our Lord was crucified on Calvary, and buried in the tomb which Joseph hewed out of the rock, but it is unwritten tradition that teaches us we are adoring the right places, and many other things of the same kind. Why do we believe in three baptisms, that is, in three immersions? Why do we adore the Cross? Is it not through tradition? Therefore the holy apostle says: “Brethren, stand fast; and hold the traditions which you have learned, whether by word, or by our epistle.” (II Thess. 2.15) Many things, therefore, being handed down to the Church by unwritten tradition and kept up to the present day, why do you speak slightingly of images?

I am not to be persuaded that the Church is set in order by imperial edicts, but by patristic traditions, written and unwritten. As the written Gospel has been preached in the whole world, so has it been an unwritten tradition in the whole world to represent in image Christ, the incarnate God, and the saints, to adore the Cross, and to pray towards the east.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

Solomon’s temple, like the Church, was decorated by images

The temple which Solomon built was consecrated by the blood of animals, and decorated by images of lions, oxen, and the palms and pomegranates. Now, the Church is consecrated by the blood of Christ and of His saints, and it is adorned with the image of Christ and of His saints.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

The Saints are deserving of honor

For if the friends of Christ are heirs of God and co-heirs of Christ, and are to be partakers of the divine glory and kingdom, is not even earthly glory due to them? I call you not servants, our Lord says; you are my friends. Shall we, then, withhold from them the honor which the Church gives them?

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

Iconoclasm requires one to follow the whole law, and therefore fall from grace

If you give up images on account of the law, you should also keep the Sabbath and be circumcised, for these are severely inculcated by it…But you must know that if you observe the law, Christ will profit you nothing.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

The Lord worked out our salvation through matter

It is not matter which I adore; it is the Lord of matter, becoming matter for my sake, taking up His abode in matter and working out my salvation through matter. For “the Word was made Flesh, and dwelt amongst us.” (Jn. 1.14) It is evident to all that flesh is matter, and that it is created. I reverence and honour matter, and worship that which has brought about my salvation. I honour it, not as God, but as a channel of divine strength and grace.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

Fidelity to Church tradition, even in the slightest thing, is critical

We are obedient to you, O King, in things concerning our daily life, in tributes, taxes, and payments, which are your due; but in ecclesiastical government we have our pastors, preachers of the word, and exponents of ecclesiastical law. We do not change the boundaries marked out by our fathers (Prov. 22.28): we keep the tradition we have received. If we begin to lay down the law to the Church, even in the smallest thing, the whole edifice will fall to the ground in no short time.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

The intention of those who venerate is what’s important

So with regard to images we must manifest the truth, and take into account the intention of those who make them. If it be in very deed for the glory of God and of His saints to promote goodness, to avoid evil, and save souls, we should receive and honour and worship them as images, and remembrances, likenesses, and the books of the illiterate. We should love and embrace them with hand and heart as reminders of the incarnate God, or His Mother, or of the saints, the participators in the sufferings and the glory of Christ, the conquerors and overthrowers of Satan, and diabolical fraud. If any one should dare to make an image of Almighty God, who is pure Spirit, invisible, uncircumscribed, we reject it as a falsehood. If any one make images for the honour and worship of the Devil and his angels, we abhor them and deliver them to the flames. Or if any one give divine honours to the statues of men, or birds, or reptiles, or any other created thing, we anathematise him.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

We honor God by venerating his holy ones

Whenever, then, you see Christians adoring the Cross, know that they are adoring the Crucified Christ, not the mere wood.* If, indeed, they honoured wood as wood, they would be bound to worship trees of whatever kind, as you, O Israel, worshipped them of old, saying to the tree and to the stone, “Thou art my God and didst bring me forth.” (Jer. 2.27) We do not speak either to the Cross or to the representations of the saints in this way. They are not our gods, but books which lie open and are venerated in churches in order to remind us of God and to lead us to worship Him. He who honours the martyr honours God, to whom the martyr bore testimony. He who worships the apostle of Christ worships Him who sent the apostle. He who falls at the feet of Christ’s mother most certainly shows honour to her Son.

St. John Damascene
Apology Against Those Who Decry Holy Images
Quoted from Leo of Neapolis, Against the Jews