Jñāneśvarī (commentary on the Bhagavadgītā) 4.178

4.178

na hi jñānena sadṛśaṃ pavitram iha vidyate
tat svayaṃ yogasaṃsiddhaḥ kālenātmani vindati
mhaṇoni aso heṃ na ghaḍe |
teṃ vicāritāṃci asaṃgaḍe |
puḍhatī jñānāceni pāḍeṃ |
pavitra na dise ||

Therefore, enough of this, it cannot be; / upon reflection it is incomparable; / there appears nothing pure / comparable to knowledge.