首楞嚴義疏注經 2.148

2.148

心性之言通於真妄，阿難執者是妄，如來示者為真，今以所執之生滅，疑於所示之妙明，故云則如來說云何無還。還，猶滅也。

The words 'nature of the mind' apply to both the true and the false. What Ānanda grasps is the false; what the Tathāgata points out is the true. Now, using the arising and ceasing he grasps to doubt the wondrous brightness that was pointed out, he therefore says: 'then why is that spoken of by the Tathāgata without return?' 'Return' is equivalent to 'cessation.'