29. From what has now been said, it appears manifest, that spirits retain in the memory what they see and hear in the other life, and that they are capable of being instructed alike as when they were men in the world, consequently of being instructed in the things of faith, and thereby of being perfected. The more interior spirits and angels are, in the same proportion they receive instruction more readily, and in a greater fullness, and retain it more perfectly: and inasmuch as this faculty abides forever, it is evident that they are continually increasing in wisdom. With the spirits of Mercury there is a constant growth in the science of things, but not in wisdom thence derived, because they love knowledges, which are means, but not uses which are ends.