7812. Besides the spirits of whom mention has now been made, there are also spirits who infuse contrary persuasions; being those who while they lived in the world were banished from the society of others, because they were evil. When they approach, there appears as it were a flying flame which glides down near the face; they place themselves beneath, at the man's hinder parts, and speak from there toward the parts above. They speak things contrary to those which the instructing spirit from the angels has said; namely, that they need not live according to the instruction, but at their own good will and pleasure, and the like. They usually come immediately after the former spirits have departed. But the men on that earth know who and of what quality these spirits are, and therefore they pay no regard to them. Nevertheless they thus learn what evil is, and so what good is; for by evil is learned what is good, the quality of good being known from its opposite. All perception of a thing is according to reflection bearing on the distinctions that come from contraries in various ways and in various degrees.