Encheiridion

Of all the faculties (except that which I shall soon mention), you will find not one which is capable of contemplating itself, and, consequently, not capable either of approving or disapproving. How far does the grammatic art possess the contemplating power? As far as forming a judgment about what is written and spoken. And how far music? As far as judging about melody. Does either of them then contemplate itself? By no means. But when you must write something to your friend, grammar will t...