(from a flier I compiled on the subject for our parish) Part 1:
Images have been used by God’s command to represent God or his holy beings to the people since the earliest times (cf Exodus 25:22 & 26:1). Even in legal-minded Israel, paintings and other artistic representations were used to help the people remember spiritual truth. From the first years of the Church, Christians used both graphic symbols and images to represent things ranging from the fact that Christians met in a certain place to depictions of events like healings, the Lord’s Supper, and burial sites.
In considering the proscription against certain uses of images in the Ten Commandments, we must note that God’s own instructions to his people specify circumstances when images are rightfully used and are not contrary to his laws. A look at the context and wording of the commandment many have erroneously used to outlaw icons clearly shows that it doesn’t flatly prohibit the use of images, but it says, “you shall have no other Gods **before **me.” The context shows that the term “graven image” is used to refer to an idol – an image created to be worshiped as a god.
An icon is not merely a religious picture designed to arouse the appropriate emotions in the beholder; it is one of the ways whereby God is revealed to man. In the incarnation human nature, body as well as soul, was assumed into the life of the Word of God; and in the renewed creation, which this incarnation has effected, the whole material world is sanctified, and the destructive opposition of matter and spirit overcome.
By the incarnation of the Word who is the image of the Father (2 Cor 4:4, Col 1:15, Heb 1:3) the image of God in every man is restored and the material world itself sanctified and again made capable of mediating the divine beauty. Icons are used as a means of expressing, as far as it can be expressed, the glory of God seen in the face of Jesus Christ (2 Cor 4:6), and in the faces of his friends. Icons are words in painting, referring to the history of salvation and its manifestation in specific persons, places, and occurrences.
St John of Damascus explained thusly: “In times past, God, without body and form could in no way be represented. But now since God has appeared in the flesh and lived among men, I can depict that which is visible of God. I do not venerate matter, but I venerate the creator of matter, who became matter for me, who condescended to live in matter, and who through matter accomplished my salvation; and I do not cease to respect the matter through which my salvation is accomplished… Just as in the Bible we listen to the word of Christ and are sanctified… in the same way through the painted icons we behold the representation of his human form… and are likewise sanctified.”