Chaucer and the Canterbury Tales Prologue question

In the Prologue to the Canterbury Tales, there is a quote in lines 737-741 where it states, "For certainly, as you all know so well, He who repeats a tale after a man Is bound to say, as nearly as he can, Each single word, if he remembers it, However rudely spoken or unfit, Or else the tale he tells will be untrue," (Each capital letter is a new line). What does this mean? I'm suppose to answer how I feel about these lines, but I don't know what these lines are saying. I guessed that it had something to do with newer generations of people listening to tales and thinking in a different and more disturbed way, but I'm not too sure.