That answer, Trid, seems a bit over the top.  The law is my second career; before that I had a degree and an almost degree (the dreaded ABD, at that) in literature and linguistics. I was talking about literary conventions, not duplicity or fabrication.  No one at the time that the Gospels were written would have expected an accurate rendering of quotes.  The speech attributed to Jesus reflects what people of the time believed was an accurate portrayal of His general message, tailored to the readers of the particular books of the Gospel.    
I don't know you, but I do know that Chapel Hill is not "some dumb University".  Bart Ehrman is a noted scholar, who writes thoughtfully and who backs up his assertions.  I'm sorry that you have the need to dismiss him because he's an agnostic.