athavā ye tattvadarśananibandhakāriṇas te sambhavadatyantāpacayāḥ, yathā bāhyaṃ śārbaraṃ tamaḥ tattvadarśananibandhakāriṇaś ca kleśajñeyāvaraṇādaya iti svabhāvahetuḥ /
Or, those [things] which serve as obstacles to the perception of truth are subject to absolute deterioration, just as external nocturnal darkness [is subject to deterioration], and [similarly] afflictions, cognitive obscurations, and so forth are obstacles to the perception of truth - thus this is a reason based upon [their] inherent nature.