中觀論疏 2.13

2.13

次泯二諦以歸不二明中道者，若作體用明之，上三種皆是用中，但用中有離有合：各明二諦中道為離，即是各正二諦義；合明二諦中道，即是合正二諦義。

Next, regarding eliminating the two truths to return to the non-dual to clarify the middle way: if clarified in terms of essence and function, the above three kinds are all the middle of function, but within function there are separation and combination: clarifying the middle way of the two truths separately is separation, which is righting the meaning of the two truths separately; clarifying the middle way of the two truths jointly is righting the meaning of the two truths jointly.