子曰:“工欲善其事,必先利其器。”①何为器?做事之工具也。亦即百工欲善其所为之事,当先修利其所用之器。诚然,做事不能无器,犹如治学不能无书;利其器乃可以善其事,亦犹如明其书乃可以专其学。所谓:“学之不专者,为书之不明也;书之不明者,为类例之不分也。有专门之书,则有专门之学;有专门之学,则有世守之能。人守其学,学守其书,书守其类;人有存没而学不息,世有变故而书不亡。”②宋代郑樵在 Son said: “Workers want good things, must first sharpen his.” “What is the device? That is to say, the best thing to do is to repair the device it uses. It is true that things can not be done without exception, as if learning can not be without books; The so-called: ”The experts do not learn for the book is unknown; unknown book, for example, regardless of also have a special book, there are specialized learning; . People keep their studies, learn their books, books keep their class; people have survived and learn endless, worldly changes and the book does not die. "② Song Qiao