Jñāneśvarī (commentary on the Bhagavadgītā) 4.179

4.179

etha jñāna heṃ uttama hoye |
āṇikahī eka taiseṃ keṃ āhe |
jaiseṃ caitanya kāṃ nohe |
dusareṃ gā ||

If knowledge here is the supreme, / is there any other like it? / Just as there cannot be / a second pure consciousness, O friend!