Sarvadarshanasangraha 2.4

2.4

anvayavyatirekāv avinābhāvaniścāyakāv iti pakṣe sādhyasādhanayor avyabhicāro duravadhāraṇo bhavet/ bhūte bhaviṣyati vartamāne cānupalabhyamāne ´rthe vyabhicāraśaṅkāyā anivāraṇāt/

On the hypothesis (of the Naiyāyikas) that it is concomitance and non-concomitance (e.g., A is where B is, A is not where B is not) that determine an invariable connection, the unconditional attendance of the major or the middle term would be unascertainable, it being impossible to exclude all doubt with regard to instances past and future, and present but unperceived. If one (a Naiyāyika) rejoin that uncertainty in regard to such instances is equally inevitable on our system, we reply: Say not so, for such a supposition as that an effect may be produced without any cause would destroy itself by putting a stop to activity of any kind; for such doubts alone are to be entertained, the entertainment of which does not implicate us in practical absurdity and the like, as it has been said, "Doubt terminates where there is a practical absurdity."[2]