14. The spirits of Mercury surpass others in the amount of knowledge they possess, both about matters within the solar system and in the starry sky beyond it. What they have once learned they retain, and recall whenever similar facts are observed. This is another clear proof that spirits have a memory, one in fact much more perfect than human beings have. They retain what they see, hear or otherwise grasp, especially if they get pleasure from it, as these spirits do from knowledge. Things that give pleasure and are loved flow in as if of their own accord and are retained. Other things do not penetrate the memory, but only make superficial contact and slip away.