金剛般若經疏論纂要 2.273

2.273

無著云：「為說法不染故、以有如是大利益故，決定演說，如是演說即無所染。」○云何演說等者，顯示不可言說故，若異此者則為染說，以顛倒義故。又，說時不求信敬等亦為無染說法○大雲云：「若能不以生滅心行說實相法，則如彼真如，故曰如如。」又，心如境如，故曰如如。不動者則無染義。

Asaṅga says: "In order that the expounding of the Dharma be undefiled, and because there is such great benefit, one decisively expounds it; expounding it in this way is precisely without defilement." As for "how should one explain it," etc., it shows that it is inexpressible; if it were otherwise, it would be a defiled exposition, on account of inverted meaning. Furthermore, when expounding, not seeking faith or respect is also expounding the Dharma without defilement. Dayun says: "If one can explain the Dharma of real mark without thoughts of arising and ceasing, it is like that tathatā; therefore it is said 'unmoving like suchness'." Furthermore, mind is like suchness, and objects are like suchness, hence 'like suchness'. Being unmoving means being undefiled.