“Life if well spent, is long. 1175. Just as food eaten without caring for it is turned into loathsome nourishment, so study without a taste for it spoils memory, by retaining nothing which it has taken in. 1176. Just as eating against one's will is injurious to health, so study without a liking for it spoils the memory, and it retains nothing it takes in.
1177. On Mount Etna the words freeze in your mouth and you may make ice of them. [Footnote 2: There is no clue to explain this strange sentence.]
Just as iron rusts unless it is used, and water putrifies or, in cold, turns to ice, so our intellect spoils unless it is kept in use.”