kathaṃ duṣṭāvagama iti cetprayatnenānvicchanto na ceddoṣamavagacchema pramāṇābhāvād aduṣṭam iti manyemahīti /
If [it is asked] "How is the defect known?", [the answer is that] if while investigating carefully we do not apprehend any defect, then due to absence of evidence [for defect], we consider [the cause] to be undefective."