首楞嚴義疏注經 2.219

2.219

責其不認也。此是汝之真性，能性於汝，謂性一切心也。前云「汝身汝心皆是妙明真精妙心中所現物。」而不自識，却從他求，豈不迷倒？此之大意，明真見離緣，周遍法界，湛然常住，妙用無邊，平等清淨，體非差別。用釋前文云「何得知是我真性。」

This rebukes him for not recognizing it. This is your true nature, which is capable of constituting your nature—meaning it natures all minds. As said earlier: 'Your body and your mind are both things manifested within the wondrously bright, true, pure, wondrous mind.' Yet, not recognizing it yourself, you instead seek it from another—how could this not be delusion? The general sense of this is to clarify that the true seeing is free from conditions, all-pervading in the dharmadhātu, limpidly and permanently abiding, boundless in wondrous function, equal and pure, and non-differentiated in its essence. It is used to resolve the earlier question: 'How can I know it is my true nature?'