[152] So that they are marvellously simple people who have ever had an idea of coming to the end of any branch of knowledge whatever. For that which has seemed to be near and within reach is nevertheless a long way distant from the end; since no created being is perfect in any department of learning, but falls as far short of it as a thoroughly infant child just beginning to learn does, in comparison of a man who both by age and skill is qualified to be a master.