1457. But it is to be observed that wherever they are in the Universe, they still operate in the same manner, like internal sensation. Neither place nor distance is of any account. They are an acting and striving force, and such effort diffuses itself into all the subjects of these sensations. But because the internal sense of the inhabitants of this earth acts only downwards, and intermingles itself with earthly and corporeal things, not being separated from them so that it can be raised upwards, or operate abstractedly, the spirits of Mercury cannot stay here. This is the reason of their wandering through the Universe. They are not allowed to operate as if they were present, except upon those who are about to speak with spirits, and who can thus be kept away from the operation of the sensual ideas of the body.