首楞嚴義疏注經 1.650

1.650

阿難已聞客塵搖動，虛空與主常自寂焉。今遇此問，例知見性無動無靜。若以動靜相形，則佛手是動，見性是靜。若只就見體所明，本不曾動，今亦無靜，此答稍符於真，故佛印言如是。

Ānanda had already heard that the guest-dust stirs and moves, while empty space and the host are ever naturally tranquil. Now encountering this question, by analogy he knew that the nature of seeing is free of movement and stillness. If movement and stillness are contrasted with each other, then the Buddha's hand is moving and the nature of seeing is still. But if clarified solely in terms of the substance of seeing, fundamentally it has never moved, nor is there now any stillness. This answer somewhat accords with the real, hence the Buddha approved it, saying, "So it is."