[150] But she, beholding the nature of the servant to be well calculated for the reception of virtue, emptied her whole pitcher into the cistern, that is to say, she emptied the whole knowledge of the teacher into the soul of the learner. For the sophists, from a desire of gain and also from envy, repressing the natural characters of their pupils, keep silence about many things which ought to be mentioned, laying up for themselves a source of gain for future times.