維摩經略疏垂裕記 2.201

2.201

問：諸佛不斷性惡，則果上三千九界無減，何名萬善之理耶？答：修惡已盡，但性惡在，此惡即善。如云鏡明具醜像性，豈令明亦醜耶？

Question: If Buddhas do not sever the evil of nature, then the three thousand [realms] of the nine realms in fruition are not diminished; why is it called the principle of myriad goods? Answer: Cultivated evil is already exhausted, but only the evil of nature remains, and this evil is precisely good. As it is said, a clear mirror possesses the nature of ugly images; does that make the clarity itself ugly?