二諦義 2.40

2.40

問：何故說此二耶？解云：眾生自謂所解為實，聖人詺云：非實，乃是虛妄。復有眾生謂其所解是第一無過者，聖人詺云：汝所解非第一，乃是世人所解耳。為是故，佛說世說俗也。俗有浮虛、風俗，世有代謝、隔別，此之四名，有廣有狹、有通有別。何者？風俗與代謝則別，浮虛與隔別則通。別則狹，通則廣也。

Question: Why are these two taught? Explanation: Sentient beings themselves consider what they understand to be real; the noble ones designate it, saying: 'It is not real, it is false and illusory.' Furthermore, there are sentient beings who consider what they understand to be supreme and unsurpassed; the noble ones designate it, saying: 'What you understand is not supreme; it is merely what worldly people understand.' For this reason, the Buddha spoke of the worldly and spoke of the conventional. The conventional has insubstantiality and custom; the worldly has succession and differentiation. These four names have broad and narrow, shared and distinct. What are they? Custom and succession are distinct; insubstantiality and differentiation are shared. Distinct is narrow; shared is broad.