prayogaḥ yadyadāvikalakāraṇaṃ tat tadā bhavatyeva, yathā samavahitasakalacakṣurādikāraṇakalāpaṃ cakṣur jñānam
[The logical] argument [is as follows]: Whenever the complete cause [of something] is present, that [effect] must occur at that time; for example, visual perception [occurs] when the complete set of its causes including the eye and other [factors] is present