首楞嚴義疏注經 10.58

10.58

「三者、是人別觀我心，精細微密猶如微塵，流轉十方性無移改，能令此身即生即滅。其不壞性，名我性常；一切死生從我流出，名無常性。」

"Third, this person separately contemplates his own mind as exquisite, subtle, and fine like a subtle dust mote, revolving throughout the ten directions with a nature that undergoes no alteration, able to cause this body to arise and perish on the spot. Its indestructible nature is called my permanent nature; all dying and living that flow forth from me are called the impermanent nature."