[Elsie]

As Fr. Brian W. Harrison, O.S., has demonstrated, we can use a series of several simple propositions to argue that Eastern Orthodoxy's account of how the Church transmits revelation is vitiated by a circular argument, and so cannot be true.

Circular argument is a LOGIC fallacy. Use of it in NO way determines the TRUTHFULNESS of the conclusion.

[bdeaner]

Circular argument is a LOGIC fallacy. Use of it in NO way determines the TRUTHFULNESS of the conclusion.

That's a good point. Let me re-phrase:

As Fr. Brian W. Harrison, O.S., has demonstrated, we can use a series of several simple propositions to argue that Eastern Orthodoxy's account of how the Church transmits revelation is vitiated by a circular argument, and therefore undermines the grounds for, and therefore the validity of, the Orthodox Church's claim to authority.