samānajātīyāni dravyāṇyadharadaśanādīni kṛtakatvādisāmānyāt asamānajātīyānyākāśādīni teṣāṃ yau mithaḥsaṃyogavibhāgau tābhyāṃ janito yaḥ prathamaḥ śabdas tasya paramparayā yaḥ kāryabhūtaḥ śrutipathamavatīrṇas tenābhidheyatvam
Homogeneous substances are [things] like lips, teeth etc., having the common property of being products; [and] heterogeneous [substances] are ākāśa etc.; from their mutual conjunction and disjunction is produced the first sound, [and] from that [arises] in succession the resultant [sound] that enters the path of hearing, [and] by that [sound comes about] expressibility.