淨名經集解關中疏 2.127

2.127

"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?")