《太平广记·卷六十三·女仙八》
因书已糜烂，李筌将书抄下来，并读了几千遍，但始终不明白《阴符》的义理。
以糜烂，筌抄读数千遍，竟不晓其义理。
Because the book was rotten, Li Quan copied it and read it thousands of times, but he still didn't understand the meaning of "Yin Fu".