[127] And it often happens that he who professes some one of the indifferent branches of knowledge, when he meets with a pupil of good natural qualifications, boasts of his success in teaching, thinking that he, by himself and alone, is the cause of his pupil’s facility in learning. And then, becoming elated and puffing himself up, he holds his head high, and draws up his eyebrows and becomes full of pride, and asks very high terms from those who desire to become his pupils; but those whom he perceives to be poor but still to be eager for instruction, he rejects and repels, as if he were the only person who had found a treasure of wisdom.