101. They reported that spirits of another kind, who travel in squadrons, often visit them, desiring to know how things are with them. They have various ways of finding out from them what they know. They said of these that they are not mad, except only in that they are so keen on knowledge for no other purpose than that of acquiring it. Later they were informed that these spirits came from the planet Mercury, that is, from the world nearest the sun, and they take pleasure only in what they know, not so much in the use to which it can be put.