"pratyakṣam anumānaṃ ca śābdaṃ copamayā saha / arthāpattir abhāvaś ca ṣaḍete sādhyasādhakāḥ" // iti neyattā syāt pramāṇānām //
And there could be no such limitation of the means of valid cognition as [stated in the verse] "Perception, inference, verbal testimony together with analogy, presumption and non-apprehension - these six are the means of establishing what is to be established."