All spirits hunger and thirst, so to speak, to know things, or to imbibe knowledge, which is to them as food and nourishment; but especially that knowledge which suited to their character. For spirits are for the most part curious, wanting to know everything that meets their senses. In fact, when anything is withheld or hidden from them, they are indignant, even grow angry, and seek assiduously and anxiously to ferret it out. When they have an abundance of knowledge, it keeps their lives enjoyable, though they do not realize this as good spirits do.