If whatever the individual judges by means of perception is true for him; if no man can assess another's experience better than he, or can claim authority to examine another man's judgment and see if it be right or wrong; if, as we have repeatedly said, Theaetetus only the individual himself can judge of his own world, and what he judges is always true and correct: how could it ever be, my friend, that Protagoras was a wise man, so wise as to think himself fit to be the teacher of other men and worth large fees; while we, in comparison with him the ignorant ones, needed to go and sit at his feet