2471. These two memories are entirely distinct and separate from each other. To the exterior memory which is properly man's while he lives in the world belong all the expressions of earthly languages, also all the objects of the external senses, as well as all facts about the world. To the interior memory belong the ideas embodied in the language spirits use, which belong to interior sight, and all rational things from whose ideas thought itself is formed. Man is not aware of this difference between the two because, for one thing, he does not reflect on the matter and for another because he is engrossed in bodily things and cannot so easily detach his mind from them.