Essence of Nyāya 2.p58

Nyāyasāra 2.p58

prāptyaprāptyaviśeṣe'pi pratiniyatārthavṛttaya eva caite sādhyasādhanatvādayo dharmā dṛṣṭāḥ | te nirākartumaśakyāḥ, sarvapramāṇāvirodhāditi