Vaiśeṣika Sūtra 2.2.41

2.2.41

sampratipattibhāvāc ca |

sampratipatti-bhāvāt—from the possibility or existence of recognition; ca—and.

35. (The eternality of Sound follows), also from the possibility of recognition.

‘Sampratipatti-bhāvāt’—i.e., from the existence of recognition. The word ‘pratipatti’ (cognition) alone would have conveyed the sense of recognition which is a particular kind of the former; therefore the prefix ‘Sam’ (in the sense of thorough-ness) implies certainty. Thus, “He is reciting the very same poem which was recited by Maitra,” “He is reading the same verse over and over again,” “You are repeatedly saying the same thing which has been said before,” “You are even now making the very same statement which was made by you last year and the year before,” “It is that same letter ga,”—on the strength of the recognition of Sound in such cases, the steadiness or permanence of Sound is proved.—35.