楞伽阿跋多羅寶經註解 1.636

1.636

This questions and explains the reason why the bodhisattva-icchantika does not attain parinirvāṇa. As for "originally in parinirvāṇa," and so forth, the sūtra says: "All sentient beings are the characteristic of nirvāṇa and cannot be extinguished again." Yet the bodhisattva does not permanently avoid parinirvāṇa; rather, realizing that cultivation is nature itself, they are free from the characteristic of nirvāṇa. The phrase "at times their roots of goodness arise," and so forth, is evident from the text.