大方廣佛華嚴經隨疏演義鈔 36.58

36.58

疏「謂了一切法即心自性，性亦非性」者，即心自性，此是表詮。由一切法無性故，即我心之實性。言性亦非性者，此是遮詮，即上真性以無性為性也。即心自性如圓成性，性亦非性，如勝義無自性性。以偈但云「了知一切法，自性無所有」故，故復遣性。

Regarding the Commentary's statement, "Meaning that one comprehends that all dharmas are the mind's own nature, and nature is also non-nature": 'the mind's own nature' is an affirmative exposition. Because all dharmas are without nature, they are the true nature of one's mind. The phrase 'nature is also non-nature' is a negative exposition, which is the aforementioned true nature taking non-nature as its nature. 'The mind's own nature' is like the thoroughly established nature; 'nature is also non-nature' is like the supreme truth's lack of intrinsic nature. Because the verse only says, "Thoroughly knowing that all dharmas / Have no intrinsic nature whatsoever," it therefore again dispels nature.