Zzyzx wrote:
Could it be that Jesus said no such things and that the words are those of people writing about him long after he was dead?
Passage of decades or generations allows folklore to add, subtract, and change words attributed to one of the characters in a story. Even after being written the words can be distorted by through copies of copies of copies by hand -- with the earliest available version a couple centuries after the supposed conversations.
If 3rd-5th century manuscripts from Egypt, Syria, Turkey, Greece etc. all agree on the text it's highly probable that they're accurately reflecting the 1st century contents; or looked at from the other angle, once there's a couple of copies of a text, and more copies being made of them over time, changes in any one copy (and its descendents) should be relatively easy to detect and it's highly improbable that a variant reading will make its way into
all copies. Which is why quite a few (mostly fairly minor) variations
are known to scholars, with some level of confidence in which ones are more likely to be original.
Along the same lines of reasoning, if a broadly similar attitude towards the Torah is portrayed in Mark's presentation of Jesus, 'Matthew' (or Q)'s presentation of Jesus, Luke's presentation of the apostles/early church, John's presentation of Jesus and Paul's presentation of his gospel of Christ, we can either suppose that they all reached similar conclusions more or less independently or that those views stem from an earlier common source. Of course some folk speculate that Paul himself is as the source, but I think that both credits Paul with more influence than is warranted and lacks the evidentiary value and parsimony that such views originated with the felllow they all say it started with.