大般涅槃經義記 7.402

7.402

後三句中皆先立喻，後合明無，文顯可知。後一明妄不污真中，「當知貪心二理各異，設復有之，何能污心」法說不污。貪妄心真，真妄兩別，故言各異。以各異故，設有貪結，不能污彼真識之心。次喻，後合。

In the latter three clauses, each first establishes a simile and then matches it to clarify non-existence; the text is evident and can be understood. In the latter one clarifying that delusion does not defile the true, "one should know that greed and the mind have two distinct principles, and even if [greed] existed, how could it defile the mind?" doctrinally states non-defilement. Greed is deluded while the mind is true, and the true and deluded are two different things, hence it says they are distinct. Because they are distinct, even if there were a fetter of greed, it could not defile that mind of true consciousness. Next is the simile, and then the correspondence.