" Later on, a long sheet of paper was given to me by some spirits from Mercury. It was irregularly shaped because it was made up of a number of individual pages glued together. It seemed to have typeset printing on it, the kind we have in our world. I asked whether they had that sort of thing in their world and they said that they did not, but that they knew that we had printed pages like that in our world. They did not want to say more than that, but I perceived they were thinking that knowledge in our world exists on paper and not in human minds. In fact, they made jokes about pieces of paper on Earth knowing things that the people there do not know. However, the reality of the situation was explained to them. "

― Emanuel Swedenborg , Other Planets (New Century Edition)