One of the marked advantages of this sort of evidence arises from the fact that it affords additional ground for localizing and dating the various classes of texts found both in original copies and in versions.
For general study the more prominent Church Fathers of the 2nd, 3rd and 4th centuries are sufficient, though profitable investigation may be made of a much wider period.
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It is also true that the earliest heretics as well as the defenders of the faith recognized the importance of accurately determining the original text, so that their remains also comprise no mean source for critical research.