Well, as St. John of Damascus (who made the very same point against the Iconoclasts of his day) put it, it is because the invisible God took on a tangible form. When God became incarnate, He placed Himself in the order of signs. Through this act God has blessed material things and made them good again, one of His acts in reversing the evil that had emitted at Eden. By rising physically from the dead, ascending bodily into Heaven and promising Christians a physical resurrection, God thus indicates that it is not wrong to be “attached” to physical things, and that matter is not inherently evil, unlike the ancient teachings of Gnosticism, which put an emphasis on all things spiritual at the detriment of the physical, attacked as the product of lesser gods who made them as a distorted shadow of the spiritual reality.
The whole heart of the iconography of Western and Eastern Christendom, which seeks to reveal the divine through visible means, is the Incarnation of Christ, when God became human, and thus visible, sharing in our flesh and blood. In this idea, the biblical commandment forbidding images was because no-one had seen God: now that we have seen the Son, we have thus seen (in one sense) God, because Christ is the image of the invisible God as St. Paul says it. In this reasoning, it is thus okay the likeness of something seen.
Of old, God the incorporeal and uncircumscribed was never depicted. Now, however, when God is seen clothed in flesh, and conversing with men, (Bar. 3.38) I make an image of the God whom I see. I do not worship matter, I worship the God of matter, who became matter for my sake, and deigned to inhabit matter, who worked out my salvation through matter. I will not cease from honouring that matter which works my salvation. I venerate it, though not as God. How could God be born out of lifeless things? And if God’s body is God by union (kaq upostasin), it is immutable. The nature of God remains the same as before, the flesh created in time is quickened by a logical and reasoning soul. I honour all matter besides, and venerate it.
Through it, filled, as it were, with a divine power and grace, my salvation has come to me. Was not the thrice happy and thrice blessed wood of the Cross matter? Was not the sacred and holy mountain of Calvary matter? What of the life-giving rock, the Holy Sepulchre, the source of our resurrection: was it not matter? Is not the most holy book of the Gospels matter? Is not the blessed table matter which gives us the Bread of Life? Are not the gold and silver matter, out of which crosses and altar-plate and chalices are made? And before all these things, is not the body and blood of our Lord matter? Either do away with the veneration and worship due to all these things, or submit to the tradition of the Church in the worship of images, honouring God and His friends, and following in this the grace of the Holy Spirit.
Do not despise matter, for it is not despicable. Nothing is that which God has made. This is the Manichean heresy. That alone is despicable which does not come from God, but is our own invention, the spontaneous choice of will to disregard the natural law,–that is to say, sin. If, therefore, you dishonour and give up images, because they are produced by matter, consider what the Scripture says: “
And the Lord spoke to Moses, saying, ‘Behold I have called by name Beseleel, the son of Uri, the son of Hur, of the tribe of Juda. And I have filled him with the spirit of God, with wisdom and understanding, and knowledge in all manner of work. To devise whatsoever may be artificially made of gold, and silver, and brass, of marble and precious stones, and variety of wood. And I have given him for his companion, Ooliab, the son of Achisamech, of the tribe of Dan. And I have put wisdom in the heart of every skilful man, that they may make all things which I have commanded thee.’” (Ex. 31.1-6) [18]
And again: “
Moses said to all the assembly of the children of Israel: ‘This is the word the Lord hath commanded, saying: Set aside with you first fruits to the Lord. Let every one that is willing and hath a ready heart, offer them to the Lord, gold, and silver, and brass, violet, and purple, and scarlet twice dyed, and fine linen, goat’s hair, and ram’s skins died red and violet, coloured skins, selim-wood, and oil to maintain lights and to make ointment, and most sweet incense, onyx stones, and precious stones for the adorning of the ephod and the rational. Whosoever of you is wise, let him come, and make that which the Lord hath commanded.’” (Ex. 35.4-10)
See you here the glorification of matter which you make inglorious. What is more insignificant than goat’s hair or colours? Are not scarlet and purple and hyacinth colours? Now, consider the handiwork of man becoming the likeness of the cherubim. How, then, can you make the law a pretence for giving up what it orders? If you invoke it against images, you should keep the Sabbath, and practise circumcision. It is certain that “
if you observe the law, Christ will not profit you. You who are justified in the law, you are fallen from grace.” (Gal. 5.2-4) Israel of old did not see God, but “
we see the Lord’s glory face to face.” (IICor. 3.18)
BTW, St. Thomas Aquinas once argued that “reverence is not due save to a rational creature”, thus we would all agree with you that to pay reverence to the paints or the materials is foolish, because they are irrational matter.
