“Do not err, my brethren: if anyone follow a schismatic, he will not inherit the Kingdom of God. If any man walk about with strange doctrine, he cannot lie down with the passion. Take care, then, to use one Eucharist, so that whatever you do, you do according to God: for there is one Flesh of our Lord Jesus Christ, and one cup in the union of His Blood; one altar, as there is one bishop with the presbytery and my fellow servants, the deacons.”
— St. Ignatius Of Antioch, Epistle to the Philadelphians, 3:2-4:1, 110 A.D.
“I reminded you many times about the atheist heretics (non-Orthodox), and now I implore you not to compromise with them on anything, do not eat or drink with them in the name of friendship, better relations, love or peace, because he who is swayed and compromises with them renders himself foreign to the Catholic (universal) church.”
“I know that after I leave savage wolves will come in among you and will not spare the flock. Even from your own numbers men will arise and distort the truth in order to draw away disciples after them.”
— St. Paul, Acts 20:29-30
“As we walk the unerring and life-bringing path, let us pluck out the eye that scandalizes us-not the physical eye, but the noetic one. For example, if a bishop or presbyter-who are the eyes of the Church-conduct themselves in an evil manner and scandalize the people, they must be plucked out. For it is more profitable to gather without them in a house of prayer, than to be cast together with them into the gehenna of fire together with Annas and Caiaphas.”
“For I reckon it misanthropy and a departure from Divine love to lend support to error, that those previously seized by it might be even more greatly corrupted.”
+ St. Maximus the Confessor, Patrologia Graeca, Vol. 91 col. 465c; as cited in The Panheresy of Ecumenism, by Metropolitan Cyprian of Orpos and Fili (Etna, CA: The Center for Traditionalist Orthodox Studies, 1995), 32.
“Keep an eye on your bishops as far as their Orthodoxy is concerned lest they go so far as to teach doctrines against the true faith or celebrate with heretics and schismatics. As far as other things, they act out of ignorance or because the days are evil and they will give an account to God only.”