bhāvasvabhāva eva hi viśiṣṭārthakriyākārī tadbhāvamātrajijñāsāyāṃ śaktir iti vyapadiśyate /
When the inherent nature of an entity [is found to be] capable of producing a specific effect, and there arises a question about that nature alone, [then] that [same nature] is designated as 'śakti' [capacity].