9793. Afterward I spoke with spirits who were from that earth, and told them many things about our earth; as that there are sciences here which do not exist elsewhere, such as astronomy, geometry, mechanics, physics, chemistry, medicine, optics, and philosophy; besides arts which also are unknown elsewhere, as the art of ship-building, of casting metals, of writing on paper, and of printing what is written, and thus of communicating it to all in the whole earth, and of preserving it to posterity for thousands of years; and that it has been so done with the Word, which is from the Lord, and that therefore the revealed Word remains unchanged in this earth (see n. 9350-9360).