起信論疏筆削記 5.38

5.38

以一下，二、結得名所以。以一切音即一音，謂差別即無差別也。一音即一切音，謂無差別即差別也。大意取無差即一，差即為圓。差即無差、無差即差，二義同時，竟無前後。兩段之中俱有此義，圓融無礙，方是如來之口密也。但以文不累書，故成前後爾。

[The passage from] "because one" onwards is, second, concluding with the reason for obtaining the name. "Because all sounds are precisely a single sound" means that difference is precisely non-difference. "A single sound is precisely all sounds" means that non-difference is precisely difference. The general meaning takes non-difference as oneness, and difference as completeness. Difference is non-difference, and non-difference is difference: these two meanings exist simultaneously, completely without before or after. Both sections contain this meaning; being completely interfused and unobstructed, only then is it the Tathāgata's secret of speech. It is merely because writing cannot record them at once that they appear as before and after.