That the arguers must accept the existence of "truth" and the reasonable principle of "rational speaking" in the mutual argument should be "shared by all" are the two basic prerequisites of "mutual argument". 但相互说理需要两个基本的前提:一是说理者必须都认可真理的存在,二是相互说理中理智地说话这一合理性原则必须是人人共同的。