The early Church applied several overlapping criteria in evaluating which books to include in the New Testament, though these were rarely stated as a formal checklist. Apostolic origin — that a book was written by an apostle or their close associate — was paramount, as Eusebius shows in tracing each gospel and epistle to its apostolic source. Broad acceptance across churches ("universal use"), doctrinal consistency with the rule of faith, and the antiquity of a text over later corruptions all served as supporting tests. Eusebius synthesized these in his threefold distinction between acknowledged books (homologoumena), disputed books (antilegomena), and spurious or heretical writings (nothoi).
The Homologoumena and Antilegomena are both canonical and orthodox, the fabrications of heretical men are neither canonical nor orthodox, while the nothoi occupy a peculiar position, being orthodox but not canonical — the most systematic ancient account of how the canon debate stood in the early fourth century.
The rule of faith prescribes belief in one God, Creator of the world, who sent forth His Word — this doctrinal standard, taught by Christ and held by the apostolic churches, was the test by which heretical writings were excluded from the canon.
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