'A child that goes to school and learns, when it arrives at years of discretion is ashamed of its childish work and destroys it. Thus shall it also happen to thee. As thou writest in such a manner thine own work shall be nought. For which reason there will be much labour for nought and in vain. For the time teacheth and giveth knowledge that not every pearl is a true pearl that is alleged so to be. Therefore a hand shall fall upon thee that will tear thee to shreds.'