Emanuel Swedenborg, Heaven and Hell — Chapter XLIII, The Immensity of Heaven
“ There are spirits whose sole pursuit is the acquisition of knowledges, because their delight is in this alone; and for this reason they are permitted to wander about, and even to pass out of our solar system into others, in acquiring knowledge. These spirits, who are from the planet Mercury, have told me that there are earths with men upon them not only in this solar system but also beyond it in the starry heaven in immense numbers. ”
