śaktīnāṃ niyamādeṣāṃ naivam ityapyanuttaraṃ / śakyam eva yataḥ kāryaṃ śaktāḥ kurvanti hetavaḥ //
[The objection that] "because of the restriction of these powers [it is] not so" is not a [valid] answer, because efficient causes produce only that effect which is possible [for them to produce].