淨名經集解關中疏 2.127

2.127

所以者何。解脫者不內不外不在兩間。文字亦不內不外不在兩間。是故舍利弗。無離文字說解脫也　此二解釋所以。肇曰。法之所在極於三處。三處未文字解脫俱不可得。如何欲離可得文字別說解脫乎。

"Why is this? Liberation is neither internal, nor external, nor between the two; letters are also neither internal, nor external, nor between the two. Therefore, Śāriputra, liberation is not spoken of apart from letters." (This is the second, explaining the reason. [Seng]zhao says: "The location of dharmas reaches its limit in these three places. If neither letters nor liberation can be found in these three places, how could one wish to depart from letters to speak of liberation separately?")