kiṃ tat kāryaṃ yataḥ sā gamyata ity āha tadbhāvetyādi / tadbhāve dhvanibhāve sati, tadbhāvitā śabdagrahaṇasya bhāvitā yā, tadeva tatra śabdavya[ñjaka]śaktau pramāṇam /
What is that effect from which it [the capacity] is inferred? [The author] answers with "tadbhāve" etc. When there is the articulation (dhvanibhāva), that which is the manifestation of sound-cognition, that alone is the proof for the capacity to manifest word-sound therein.