《太平广记·卷九·神仙九》
如果四十年到了还找不到值得传授的人，那也不能因为年限到了胡乱传授，须等八十年，如有两个人可传授，就传给两个人。
世无其人，不得以年限足故妄授。若四十年无所授者，即八十年而有二人可授者，即顿接二人。
If forty years have passed and no one worthy of being passed on has been found, then one cannot pass on the teachings indiscriminately because the time has come. One must wait eighty years. If there are two people who can be passed on to, then the teachings can be passed on to two people.