Brunetto Latini
Then, when we have gone through the temperaments, we come to what may be called the five senses—in the occult sense. For in the way man ordinarily speaks of the five senses, he only knows them from outside. You cannot learn to know the senses inwardly till you have descended through the temperaments into the deeper regions of your own self. Then you behold the eyes, the ears, the other senses from within. You experience your own eyes, for instance, or your ears—filling them from within. You must imagine it thus. Just as you came into this hall through this door, and perceived the objects and persons that were already here, so when you undergo this descent into yourself you come into the region of your eyes or your ears. There you perceive how the forces are working from within outward, to bring about your seeing and your hearing. You perceive an altogether complicated world, of which a man who only knows the outer physical plane has no idea at all.