The undivided church is the standard.
The faith of the seven councils, before East and West parted — catholicity measured by antiquity, not by Rome's latest word.
The Old Catholic standard is the church of the first millennium, before the schism of 1054: whatever was believed everywhere and always is binding, and later Roman developments are not. That principle, drawn from Vincent of Lérins, is why the churches accept the seven ecumenical councils and reject papal infallibility, mandatory clerical celibacy, and the Immaculate Conception as later additions.
The same ground, other faiths
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