首楞嚴義疏注經 9.314

9.314

想者取像，謂要先安立境分劑相，方能隨起種種名言。念緣不息，即名浮動，念即想也。浮想既除，觀心轉淨，故云如去塵垢。一倫生死，謂行陰倫類也。首尾，本末也。以行是遷流，遷流即生滅。今無想隔，故本末皆現，即生滅體露。觀心明見，故云圓照。

'Perception' means grasping images, meaning that one must first establish the boundary marks of an object before one can subsequently generate various names and words. Thoughts and conditions not ceasing is called 'floating and moving'; 'thought' is just 'perception'. When floating perceptions are removed, the contemplating mind becomes purer, hence it says 'like the removal of dust and dirt.' 'A single category of birth and death' refers to the category of the aggregate of volitional formations. 'Beginning and end' means root and branch. Because volitional formations are a continuous flow, and flowing is arising and ceasing: now without the obstruction of perception, root and branch both appear, meaning the substance of arising and ceasing is exposed. The contemplating mind clearly sees it, hence it says 'fully illuminated.'