yasya tvatputratvādityādikasyānumānāder gocare viṣaye pratyakṣeṇa bādhā sambhavet tasya prāmāṇyam eva nāsti bādhyamānaviṣayatvenārthasaṃvādābhāvāt taimirikādijñānavat
If the subject matter of an inference like "because it is your child [it must be dark-complexioned]" could be invalidated by perception, then that [inference] has no validity at all, because due to its subject matter being invalidated there is no correspondence with reality, like the cognition of one with eye disease