There cobblers lecture on orthopedy (whatsoever that may be) because they cannot sell their shoes; and poets on AEsthetics (whatsoever that may be) because they cannot sell their poetry.

鞋匠们讲授矫形术（不管是什么），因为他们的鞋子卖不出去；和美学上的诗人（无论是什么），因为他们无法出售自己的诗歌。