For folk literature in particular, it is not enough to look only at the books in your own area of research. The more broad your investigations, the more you will come to understand the origins and development of stories and the differences in how peoples think.
尤其民間文學，只看自己研究領域的書是不夠的，調查愈廣，愈明白故事的來龍去脈，也瞭解各個民族間想法的異同。