anyathā hīdam eva codanīyaṃ kāryavyatirekato 'pi kathaṃ bāhyasiddhiḥ syād iti kāraṇamātrāstitvaṃ siddhyen na tu bāhyam tat tu kāraṇaṃ svapnādāvivāntaram api sambhāvyamityalaṃ prasaṅgena /
Otherwise, this itself would need to be questioned: "How could external reality be established even from the absence of effects?" [In that case] only the existence of a cause would be established, not anything external, since that cause could possibly be internal, just as in dreams. But enough of this digression.