[16] But also because Aristotle bears witness to this fact in the case of Plato, who, from his great reverence for philosophy, would never have spoken falsely, and also because no one can possibly be more to be credited in the case of a teacher than his pupil, especially when the pupil is such a man as this who did not apply himself to instruction lightly with an indifference easily satisfied, but who even endeavoured to surpass all the discoveries of former men, and did actually devise some novelties and enrich every part of philosophy with some most important discoveries.