“Like the holy apostles, the holy fathers and the teachers of the Church confess the unity and uniqueness of the Orthodox Church with the divine wisdom of the cherubim and the zeal of the seraphim. Understandable, therefore, is the fiery zeal which animated the holy fathers of the Church in all cases of division and falling away and the stern attitude toward heresies and schisms. In that regard, the holy ecumenical and holy local councils are preeminently important. According to their spirit and attitude, wise in those things pertaining to Christ, the Church is not only one but also unique. Just as the Lord Christ cannot have several bodies, so He cannot have several Churches. According to her theanthropic nature, the Church is one and unique, just as Christ the God-man is one and unique.
Hence, a division, a splitting up of the Church is ontologically and essentially impossible.”
+ St. Justin Popovich, The Attributes of the Church
Originally published in Orthodox Life, vol. 31, no. 1 (Jan.-Feb., 1981), pp. 28-33