清代医家张志聪在《侣山堂类辩》自序中说：“夫天下有理所同者，同，无容辩；天下有理所异者，异，亦无容辩。即天下有理之同，而勿为理之所异；理之异，而或为理之所同者。同中异，异中同，又无容辩。惟是理之同矣，而同者竟若异；理之异矣，而异者竟若同。同之不可为异，异 Zhang Zhicong, a physician of the Qing Dynasty, said in the preface of “Lvshan Hall Class Debate:” There is no reason to dispute whether there is any difference in the world, Differences in reason, but also for the reason of the same person with the same difference, the same in the same, but also without argument, but with the same reason, while those who actually different if different Carry on, and different people actually if with the same can not be different, different