The people of the Old Testament were forbidden to make and worship idols. There are several texts that explain this, but some heretics separate the first part of those texts from the second and distort their interpretation. In the Old Testament, God appeared through actions and spoke through the mouths of the prophets. In the New Testament, the Word of God became incarnate, “and we have seen his glory,” and established a personal relationship with us. Therefore, we can depict the person of Christ in the icon.