《幼学琼林·卷三·器用》
董安于慢性子，经常佩带弓弦以督促自己迅速一些；西门豹急性子，经常佩戴熟牛皮，以提醒自己缓和一些。
董安于性援，常佩弦以自急；西门豹性急，常佩韦以自宽。
Dong Anyu is a slow paced person, and often wears a bowstring to urge himself to be quicker; Ximenbao is a hasty person, and often wears cooked cowhide to remind himself to slow down.