9106. They also said that another kind of spirits who move around in troops frequently approach them, desiring to know what things are like among them, and by various methods they elicit from them the things they know. They said that these spirits are not insane, except in their wishing to know so many things for no other purpose than that they may know them. Afterwards they were told that those spirits come from the planet Mercury. Knowledge and the resulting intelligence alone delight such spirits, rather than the useful services that result from them, unless the useful services are also a matter of knowledge to them, 6811, 6815, 6921-6932, 7069-7079, 7170-7177.