Sarvadarshanasangraha 16.63

16.63

nanv itthaṃbhūte brahmaṇi kiṃ pramāṇaṃ pratyakṣam anumānam āgamo vā/ na kadācit tatra pratyakṣaṃ śramate/ atīndriyatvāt/ nāpy anumānam/ vyāptasya liṅgasyābhāvāt/ nāpy āgamaḥ/ yato vāco nivartante iti śrutyaivāgamagamyatvaniṣedhāt/ upamānādikam aśakyaśaṅkam/ niyataviṣayatvāt/ tasmād brahmaṇi pramāṇaṃ na saṃbhavatīti cet

Now, what is the means of valid cognition for Brahman of this nature: perception, inference, or scripture? Perception never operates with respect to it, because it transcends the senses. Nor does inference, because there is no pervaded inferential sign. Nor scripture, because knowability through scripture is negated by the scriptural text itself: “Wherefrom words turn back.” [Other means of valid cognition] such as comparison cannot even be suspected [to operate], because they have restricted domains. Therefore, if it is urged that no means of valid cognition is possible with respect to Brahman—