Vaiśeṣika Sūtra 2.2.35

2.2.35

doṣāt |

abhivyaktau—in (the theory of the) manifestation or revelation (of Sound); doṣāt—from defect; Because there will be a defect.

30. (Sound is not eternal), because the theory that it requires to be revealed only, will entail a defect.

On the theory of the revelation of Sound, the defect will arise that (in each case) an invariable relation of the revealer and the revealed will have to be admitted in respect of things co-existent and capable of being perceived by the same sense. But the invariable relation-ship of the revealer and the revealed is nowhere observed of such things. If it be not assumed here, then it will follow that on the manifestation of one letter, say ka, all the letters will become manifest. The rejoinder that an invariable relation of the revealer and the revealed is in fact observed to obtain among the characteristic of being existent, the characteristic of being a man, and the characteristic of being a Brāh-mana, which are also co-extensive and are revealed by their individual difference, situation, and origin, is invalid. For they lack in being co-extensive, inasmuch as the extension of the characteristic of being a man, or of the characteristic of being a Brāhmaṇa, is not so large as that of the characteristic of being existent.—30.