仁王護國般若波羅蜜多經疏 2.254

2.254

解曰：由此得為眾生之本者下，有二義。有說：此者上本覺也，謂由本覺隨不覺故，動眠三界輪迴六趣，故此本覺為眾生本。亦是諸佛菩薩行本者，無明微薄，本覺力增心歸本原，從末向本隨位次第建立五忍，至寂滅忍本覺湛然，本無動達、今無靜故，此本覺亦是諸佛菩薩行本。有說：此者即五忍也，是發大乘趣無上者，從始至終修行之本。亦是諸佛菩薩行本者，亦是法界已成未成佛菩薩本。是為已下，如文易了。

The commentary states: Below 'Because of this, it is able to be the root of sentient beings', there are two meanings. Some say: 'this' refers to the original awakening above; that is, because original awakening accords with non-awakening, stirring and slumbering in the three realms and transmigrating through the six destinies, this original awakening is the root of sentient beings. Regarding 'is also the root of practice of the Buddhas and bodhisattvas', as ignorance becomes subtle and thin, the power of original awakening increases, and the mind returns to its original source; proceeding from the branch toward the root, the five kṣāntis are established in sequential stages, and upon reaching the quiescent kṣānti, original awakening is serene—originally there was no movement to reach, and now there is no stillness; therefore, this original awakening is also the root of practice of the Buddhas and bodhisattvas. Others say: 'this' refers to the five kṣāntis, which are the root of practice from beginning to end for those who generate the Mahāyāna and proceed toward the unexcelled. Regarding 'is also the root of practice of the Buddhas and bodhisattvas', it is also the root of the Buddhas and bodhisattvas in the dharmadhātu, both those who have already achieved it and those who have not. From 'this is' onward is easy to understand from the text.