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St. Ambrose of Optina: . . . In this way, it overturned the entire ancient Apostolic office that accomplishes almost all the Mysteries and all the ecclesiastical institutions . . . - Orthodox Church Quotes
But just as one mistake–which is not considered a mistake–always brings another one in its train, and one evil begets another, so the same happened with the Roman Church. This incorrect philosophizing that the Holy Spirit proceeds also from the Son, having just barely appeared in the West, already then gave birth to other similar …