成唯識論了義燈 6.130

6.130

又云：不說無明有善性故下，別難善心，起亦有執，即癡與無癡二法應俱。若許爾者，違《瓔珞本業經》，明、闇一相，善、惡一心，是洴沙國外道師偈，何故不俱正相違故？

It also states: 'Because it is not said that ignorance possesses a wholesome nature,' and so forth, specifically objecting that wholesome minds in arising would also possess grasping, and then the two dharmas—delusion and non-delusion—would have to coexist. If this is accepted, it contradicts the Yingluo benye jing: 'Light and darkness sharing a single characteristic, wholesome and unwholesome in a single mind' is the verse of a tīrthika master from the country of Magadha; why do they not coexist? Because they are directly contradictory.