Scripture provides an orthodox, protestant and catholic principle

Update: I am sceptical that these three movements have not long dwelt in dreadful apostasy (with very few exceptions of individual members of these movements). Please see my articles at christrescues.substack.com and my Translator's Preface to The Christ Family Bible.

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It is a blessed thing to see that in Holy Scripture, an orthodox, catholic and protestant principle are all clearly described and set forth as principles to follow.

An orthodox principle: All churches must conform to what is the established practice (doxa) of the churches. This is the clear witness of the New Testament, e.g. in 1 Corinthians 11:16.

A protestant principle: All churches must protest against sinful, i.e. mistaken, behaviour, especially by church leaders, even bishops. This is the clear witness of the New Testament, e.g. in Galatians 2.

A catholic principle: All churches must submit to the decisions of a single council led by the Holy Spirit and a single presiding bishop. This is the clear witness of the New Testament, e.g. in Acts 15.