大乘起信論廣釋卷第三．四．五 4.136

4.136

[Treatise:] Furthermore, the tathāgatagarbha [has no posterior limit, and the nirvāṇa attained by the Buddhas, being associated with it,] also has no posterior limit—
[Commentary:] "Explication": This shows that there is no end. The pattern of phrasing in this text seems to say that the nirvāṇa attained by the Buddhas, because it is associated with the tathāgatagarbha, has no posterior limit. Since that is not the intended meaning, it should correctly be stated that the Buddhas and Tathāgatas are associated with it, and the nirvāṇa attained thereby has no posterior limit. That is, because this nature of the garbha has no posterior limit, the cognition of all Tathāgatas realizes and is associated with it, and thus the attained nirvāṇa [has no] posterior limit. Therefore the new translation states: "Realizing this, one forever severs the seeds of saṃsāra and attains nirvāṇa, which also has no posterior limit."