'Tis the custom of pedagogues to be eternally thundering in their pupil's ears, as they were pouring into a funnel, whilst the business of the pupil is only to repeat what the others have said: now, I would have a tutor to correct this error, and that, at the very first, he should, according to the capacity he has to deal with, put it to the test, permitting his pupil himself to taste things, and of himself to discern and choose them, sometimes opening the way to him, and sometimes leaving him to open it for himself; that is, I would not have him alone to invent and speak, but that he should also hear his pupil speak in turn.... Let him make him put what he has learned into a hundred several forms, and accommodate it to so many several subjects, to see if he yet rightly comprehends it, and has made it his own.... 'Tis a sign of crudity and indigestion to disgorge what we eat in the same condition it was swallowed: the stomach has not performed its office, unless it have altered the form and condition of what was committed to it to concoct.... Let him make him examine and thoroughly sift every thing he reads and lodge nothing in his fancy upon simple authority and upon trust, Aristotle's principles will then be no more principles to him than those of Epicurus and the stoics: let this diversity of opinions be propounded to, and laid before, him; he will himself choose, if he be able; if not, he will remain in doubt. "Che, non men che saper, dubbiar m'aggrata." DANTE, _Inferno_, xl, 93. ["That doubting pleases me, not less than knowing." LONGFELLOW'S _Translation_.]