tat kāraṇaviruddhavidhānād vā, yathā romaharṣādikāraṇaśītaviruddhadahanaviśeṣavidhānācchītakāryaromaharṣādiniṣedhaḥ
Or [negation follows] from affirming what is contrary to its cause, as the negation of horripilation and other effects of cold [follows] from affirming a particular instance of heat that is contrary to cold, which is their cause.