Just a thought, which no doubt has been already expressed on here, if not in the same form.
We know how much emphasis the WTS puts on teaching that the gospels are authentic historical reports. However, we can see at least one domain where this historicity must be considered cautiously. As we all have noticed, John's gospel style is quite particular and you can say right away if a sentence is drawn from John's gospel. This is also true of Jesus's words when reported by John. So, since Jesus was evidently speaking in only one style and would not use a specific way of talking in events reported by John, we can draw the conclusion, unless of course we consider John's gospel as spurious because it is too different from the three other gospels, that we actually don't know precisely what were Jesus's actual words. If we extend that reasoning to the whole Bible, we will view the latter as a message that God delivered to men where all that we can, and have to, do is get the general drift thereof, with literal exegesis being largely useless.