guṇādīnāṃ parasantānavartināmargāgdarśanasyātīndriyatvāt tadaniścaye doṣābhāvasyāpyaniścayād apramāṇadvayāsattvamapyaniścitam iti na guṇādibhyaḥprāmāṇyaṃ siddhyet
Since excellences etc. occurring in others' mental continua are beyond the senses of those with limited vision, there is uncertainty about them; due to uncertainty about the absence of defects, the absence of two types of invalid cognition is also uncertain - thus validity cannot be established from excellences etc.