成唯識論述記 5.569

5.569

述曰：說「異生類恒處長夜」，夜是闇故，無明恒有說為「長夜」；若生死中無無明者，便中明故。「無明所盲」者，謂此不共恒現行故，盲其惠眼。不爾，中途有無無明時，即非無明盲。「惛昧醉亂」，恒自纏心，「曾無醒覺」；惛即無覺，醉即無醒；若中途有無無明時，便有醒覺。以此經證無明恒行，遍三性位，不爾恒行。

The Commentary states: It says "ordinary beings constantly dwell in the long night": night is darkness, so because ignorance constantly exists, it is called the "long night"; if there were no ignorance in saṃsāra, there would be light in the midst of it. "Blinded by ignorance" means that because this unshared [ignorance] constantly operates actively, it blinds their eye of wisdom. Were it not so, if midway there were a time without ignorance, one would not be blinded by ignorance. "Confused, intoxicated, and disorderly," it constantly entangles the mind of itself, "never waking up"; confused means having no awareness, and intoxicated means having no sobriety; if midway there were a time without ignorance, there would be awakening. By this sūtra it is proven that ignorance operates constantly, pervading states of all three natures; otherwise it would not operate constantly.