There is historical record showing that John 6 was interpreted by the first Christians as literal and not symbolically. So the question is did this Spirit, which allowed for this interpretation, and who was the interpretation of Jesus words for the first 1500 years the Christian era, remained silent after the death of the aposples only to reapear during the Reformation? If we use the litmus test imposed by the "Sola Scripturalists" and look to scripture, we see that in fact the spirit of God does not behaves in this way. From the events of Exodus, God has never abandoned his people, yes they where times that it looked that God had forsaken them, but you and I know that he was always there by means of his prophets and his message never changed.
So it seems to me that the evidence leans towards the fact that the interpretation of these passages for the first 1500 years of the church was inspired by the Holy Spirit.
I would be interested in seen how giving examples from scripture we can see that this sort of behavior from the Holy Spirit can be justified.