So if a man's wit be wandering, let him study the mathematics; for in demonstrations, if his wit be called away never so little, he must begin again.　If his wit be not apt to distinguish or find differences, let him study the schoolmen; for they are cymini sectores.　If he be not apt to beat over matters, and to call up one thing to prove and illustrate another, let him study the lawyers' cases.　So every defect of the mind may have a special receipt. 如智力不集中，可令读数学，盖演题需全神贯注，稍有分散即须重演；如不能辩异，可令读经院哲学，盖是辈皆吹毛求疵之人；如不善求同，不善以一物阐证另一物，可令读律师之案卷。如此头脑中凡有缺陷，皆有特效可医。