Beneath the five senses there is one principal sense that works through the others. It is through this sense that one feels deeply, and distinguishes between the impressions which come from outside. Every impression and experience gained by this sense is recorded on the mind. This record is made up of deep lines, and the nature of these lines deeply set in the mind is to want the same thing that has already been recorded, according to the depth of the line. And it is according to the depth of the line that one needs the thing that one has once experienced. For instance, the liking for salt, sour, or pepper are acquired tastes, and the sign of this acquisition is the deep line that is on the mind. Each line so produced wishes to live upon its impression, and the lack of that experience is like death to that line. Unpleasant flavors such as fish, or vinegar, or cheese, become pleasant after the line is formed. Tastes even more unpalatable than these may become excessively agreeable once the line is well engraved on the mind.