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St. Ignatius of Antioch: . . . if anyone follow a schismatic . . . - Orthodox Church Quotes
“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 …