維摩經略疏 2.56

2.56

問：上用二諦以歎佛智，今明說法那約三諦？答：有無為俗、中道是真，即二諦也。

Question: Above, the two truths were used to praise the Buddha's wisdom; now in explaining the preaching of the Dharma, why is it in terms of the three truths? Answer: Existence and non-existence constitute the conventional, and the Middle Way is the true; these are indeed the two truths.