yataḥ sādhyaviparyayasādhanād viruddha iṣyate naca viśeṣaḥ sādhayitumiṣṭaḥ / vastubalapravṛttānumāne viṣaye na viruddhāvyabhicārī ca sambhavati /
Because [something] is considered contradictory [only] when it proves the opposite of what is to be proved, and no particular [case] is intended to be proved [here]. In the case of an inference proceeding by force of [real] things, neither contradiction nor deviation is possible.