prayogaḥ yat kādācitkaṃ tadutpattimatkāraṇajanyam yathā ghaṭavyaktiviṣayaṃjñānam kādācitkaṃ ca śabdajñānam iti svabhāvahetuḥ
The formal argument is: Whatever is occasional is produced by a cause that has [itself] been produced - like the cognition of a particular jar; and the cognition of sound is occasional - this is a reason based on essential nature