tatra sattva ātmā nityaścāsau sattvaśceti nityasattvaḥ / yadvā nityaṃ sattvam sattā yasya sa tathoktaḥ / nitya iti yāvat /
Here, "sattva" [means] the Self, and it is both eternal and existent, hence [the compound] "nityasattva." Or, [it can be analyzed as] "that whose existence (sattā) is eternal (nitya)," hence it is called thus - that is to say, [it is] eternal.