sādhanam gamakam / atha mābhūdyathoktadoṣa iti tasya hetoḥ sādhyadharmiṇi sadbhāva āśrīyate /
The probans is that which proves. Thus, [one might say] "let not the aforementioned fault arise," and therefore resort to [claiming] the presence of that probans in the subject to be proven.