維摩經玄疏 6.30

6.30

三、約諦分別者，明法性實相之理不出諦也，故須約諦分別。但諦有三種：一者，三諦；二者，二諦；三者，一諦。

Third, distinguishing in terms of truths: clarifying that the principle of the true mark of dharma-nature does not go beyond the truths; therefore one must distinguish it in terms of truths. But truths are of three kinds: first, the three truths; second, the two truths; third, the one truth.