首楞嚴義疏注經 10.244

10.244

本觀圓融清淨覺體，今見識陰離行生滅，謂深且妙，立為涅槃。不知流注，故不前進。

Originally contemplating the perfectly fused, pure enlightened essence, now seeing the aggregate of consciousness free from the arising and ceasing of formations, they deem it profound and subtle and establish it as nirvāṇa. Not knowing of its continuous flow, they do not advance further.