anvayavyatirekābhyāṃ yatkāryaṃ yasya niścitaṃ / niścayas tasya taddṛṣṭāviti nyāyo vyavasthitaḥ //
When an effect is definitely ascertained to belong to a [particular] cause through positive and negative concomitance, then the perception of that [effect] establishes [the presence of] that [cause] – such is the established rule.