The Mystagogy of the Holy Spirit;

"Mr. Farrell... has given us a text which is faithful to Saint Photios' original Greek text; a theological overview of the filioque controversy - an essential controversy in the history of the whole Church - that is not too technical to be understood by an untrained theologian; and an historical view of this subject and Saint Photios that presents no problem to the reader untrained in historical investigation. His is not the only translation to be had in a modern language, but it certainly is the only translation which consciously attempts to reach the average Orthodox reader... introducing the faithful to the inner spirit of the Patristic witness." -Archmandrite Chrysostomos