In the expression "writing icons" there is already something that can be learned about what an icon is. Tradition has long used this designation in order to indicate that an icon is a visible manifestation of the content of the Sacred Scriptures. Thus, in an icon the artist is writing the scriptural content in form and color and story. The holiness of an icon and the presence of God that it imparts derive from the Scriptures. In the same way that God in Christ is incarnate and present to us in the Scriptures, so also is He present in the form, the color, and the narrative of the icon.
-Fr. Jeremy Driscoll, OSB