Aristotle’s Ethics begins with the following,
Every art, and every science reduced to a teachable form, and in like manner every action and moral choice, aims, it is thought, at some good: for which reason a common and by no means a bad description of the Chief Good is, “that which all things aim at.”
My first thought was why is the clause “reduced to a teachable form” even necessary? Every art and science should be reduced to a teachable form. Of what value is art or science if it is not taught? A teacher’s raison d’être is to confer knowledge and understanding. A teacher’s job is never done as long as ignorance and misunderstanding exist. Today’s teachers worry about getting tenure for security. A teacher’s security should be based on how well that teacher eliminates ignorance and corrects misunderstanding.