首楞嚴義疏注經 10.59

10.59

我心如微塵者，以心性微密難見，故如微塵，非謂其小也。此執微細心性，以之為我。我者，自在、主宰為義，故能流轉，性無移改，却能令此麁蘊色身有生有滅。以此麁蘊皆從我心所流出故，所流出者名為無常，能流出者名為常性。

"My mind is like a subtle dust mote": because the mind-nature is subtle, dense, and difficult to see, it is likened to a subtle dust mote, not that it is physically small. Here he grasps the subtle mind-nature, taking it to be the self. "Self" has the meaning of autonomy and masterhood; hence it can revolve while its nature undergoes no alteration, yet it can cause this coarse physical body of aggregates to have arising and ceasing. Because these coarse aggregates all flow forth from my mind, what flows forth is called impermanent, and that which is able to emit it is called the permanent nature.