大般涅槃經疏 6.6

6.6

從「我今安住」下，第四結祕密藏安住三法。此結三德入大涅槃結祕密藏。如世伊字是結三點，文略不結天目。然佛常安住三法，而言我今者，蓋隨緣宜，故云為眾生故名入涅槃，即此意也。

From "I now dwell peacefully..." onward is the fourth part, concluding the secret treasury by dwelling peacefully in the three dharmas. This concludes that the three virtues entering the great nirvāṇa constitutes the secret treasury. "Like the worldly letter *i*" concludes the three dots; the text abbreviates and does not conclude with the divine eyes. However, the Buddha constantly dwells peacefully in the three dharmas; that he says "I now" is simply in accord with what is appropriate for the conditions—therefore, saying "for the sake of sentient beings, it is called entering nirvāṇa" is precisely this meaning.