Quote by St. Maximos the Confessor

Even if the whole universe holds communion with the [Latinizing] Patriarch, I will not communicate with him. For I know from the writings of the holy Apostle Paul: the Holy Spirit declares that even the angels would be anathema if they should begin to preach another Gospel, introducing some new teaching.

+ St. Maximos the Confessor, The Life of Our Holy Father St. Maximus the Confessor (Boston: Holy Transfiguration, 1982)


Source online:

http://orthodoxchurchquotes.com/category/sayings-from-saints-elders-and-fathers/st-maximos-the-confessor/