sarveṣām iti / na kevalaṃ varṇasyārthapratītyanyathānupapattyā nityatvaṃ siddham, kiṃ tarhi---, tālvādīnāṃ dhvanīnāṃ ca /
"Of all [things]" means: not only is the eternality of letters established through the impossibility of meaning-cognition being otherwise [explained], but [also the eternality] of the palate etc. and of sounds.