tasmād yasminnekākāraparāmarśavyavasthitārthakriyāsāmarthyamātrapratipāditamevābhedaṃ parāmṛśya saditi śrutiṃ viniveśayanti samayakṛtaḥ
Therefore the makers of convention apply the term "sat" ["existent"] after observing the identity [of things] that is established merely through the apprehension of their uniform capacity to perform purposeful actions.