yā ca kāryānupalabdhisattā na sā kāraṇamātrasyābhāvaṃ gamayati / kiṃ tarhi apratibaddhasāmarthyasyaiva /
And the presence of non-apprehension of an effect does not indicate the absence of all causes, but rather [indicates] only [the absence] of that [cause] whose efficacy is unimpeded.