See this free ebook:

  • Apologia Against Those Who Decry Holy Images, by St. John of Damascus, translated by Mary H. Allies.May be read online at the Internet Medieval Source Book (Scanned by Gabriel Caswell and Dr. Stephen J. Shoemaker.  Prepared for HTML by Dr. Stephen J. Shoemaker).

On the Feast of St. John Damascene, Father of the Church.