St. John of Damascus on icons

St. John of Damascus, an eigth century Father of the Church, who wrote at the height of the iconoclastic (anti-icon) controversies in the Church, explains:

Because the Word of God became flesh (John 1:14), we are no longer in our infancy; we have grown up, we have been given by God the power of discrimination and we know what can be depicted and what is indescribable. Since the Second Person of the Holy Trinity appeared to us in the flesh, we can portray Him and reproduce for contemplation Him Who has condescended to be seen. We can confidently represent God the Invisible -- not as an invisible being, but as one Who has made Himself visible for our sake by sharing in our flesh and blood.