維摩義記 1.42

1.42

問曰：滅道常淨可爾。苦集染法，云何言淨？觀此破染，能淨名淨。又此法相不同情取，故亦名淨。

Question: Cessation and the path being constantly pure may be granted. But suffering and origination are defiled dharmas; how can they be said to be pure? Answer: Contemplating these destroys defilement; being able to purify is called pure. Moreover, these characteristics of dharmas are not grasped by emotional preferences; hence they are also named pure.