tatra ko 'yam arthakriyāsaṃvādo nāma / yadi bāhyārthaprāptiḥ sā na siddhā bāhyārthasiddhes tasyaiva sādhyatvenaprastutatvāt /
What is this so-called "compatibility with purposeful action"? If it is the attainment of external objects, that is not established, since the existence of external objects is itself what is to be proved.