I understand that; i just dont understand how anyone thinks it is reasonable.
Its like if we had no words that Reagan actually said, or Kennedy; just remembered the spirit of it, and tried to reconstruct it years later.
nobody wrote that stuff down as it was spoken by Jesus!
Why do you think that? Have you ever heard of Q? The existence of a common book of the sayings of Jesus is the most likely explanation for the duplication of the wording when quoting Jesus in the gospels of Matthew and Luke. In addition to this, we have the fact that the gospels were all written and "published" while there were hundreds of witnesses to the teachings of Christ still living who could and would have denounced incorrect accountings of those teachings. Plus we have much of what Christ talked about were the Scriptures (OT prophets, etc) and explaining what those Scriptures
really meant deep down in the spirit of the message - dividing the letter of the law from its spirit. Having those Scriptures already written out and near at hand, they could easily be reminded of Christs words concerning those Scriptures.
Add to all of this the stuff that you would find incredible - the guiding of the Holy Spirit who recalled to their minds the exact words of Christ, God's ability to preserve His Word without corruption, and the fact of the indwelling of the Holy Spirit in each and every Christian, so that we recognize the words of the Son as True.
With all of that, and loads more, in favor of the reliability of the faithful recording of the words of Jesus, it is totally reasonable and rational to believe those words as recorded.