Well, there are fragments and quotations in letters even from the first century that have survived, so you can make a diff between any overlap. If the topic is

Well, there are fragments and quotations in letters even from the first century that have survived, so you can make a diff between any overlap. If the topic is of interest, one could even use stemmatology to figure out the most likely original using something like what was done here: http://agenda.albanova.se/getFile.py/access?contribId=263&resId=250&materialId=slides&confId=2436 http://agenda.albanova.se/getFile.py/access?contribId=263&am...