十二門論宗致義記 1.18

1.18

問：若爾，應壞二諦，以因果即空，故失幻有，壞俗諦；空即因果，故失真空，壞真諦。答：正由不異，二諦得存；若不爾者則失二諦。何者？謂異空之因果非幻法，故失於俗諦；異因果之空非真空，故失於真諦。是故二諦得存由於不異，不異則是中道平等，是則由中道而有二諦，則是中道二諦也。

Question: If that is so, it should destroy the two truths, because cause and effect being identical with emptiness loses illusory existence and destroys the conventional truth, while emptiness being identical with cause and effect loses true emptiness and destroys the ultimate truth. Answer: It is precisely because they are not different that the two truths are preserved; if it were not so, then the two truths would be lost. How so? Cause and effect different from emptiness would not be illusory dharmas, and thus would lose the conventional truth; emptiness different from cause and effect would not be true emptiness, and thus would lose the ultimate truth. Therefore, that the two truths are preserved is due to non-difference; non-difference is the equality of the middle way; and thus it is by the middle way that there are two truths, which is precisely the two truths of the middle way.