evam manyate ya eva tu ubhayaniścitavācī sa eva sādhanaṃ dūṣaṇaṃ vā, na anyataraprasiddhaḥ sandigdhavācī, punaḥ sādhanāpekṣaṇād iti nyāyāt
[The opponent] thinks thus: "Only that which expresses what is ascertained by both parties can be either a proof or a refutation - not what is established by only one party or what expresses something doubtful, according to the principle that [such arguments] would require further proof."