4. Nor can the mark of presumption be set on my task, since, when they had those from whom they could learn, they sought my good-will rather than my teaching, and my zeal may be excused, since when they had the guidance of a martyr for the observance of discipline, I did not think it superfluous if I could turn the persuasion of my discourse into an allurement to profession. He who teaches with facility restrains fault with severity; I, who cannot teach, entice.