Chandogya Upanishad 7.7.2

7.7.2

sa yo vijñānaṃ brahmety upāste \
vijñānavato vai sa lokāñ jñānavato 'bhisidhyati \
yāvad vijñānasya gataṃ tatrāsya yathākāmacāro bhavati yo vijñānaṃ brahmety upāste \
asti bhagavo vijñānād bhūya iti \
vijñānād vāva bhūyo 'stīti \
tan me bhagavān bravītv iti \\707.2\

2. He who reverences Understanding as Brahma—he, verily, attains the worlds of Understanding (vijñāna) and of Knowledge (jñāna). As far as Understanding goes, so far he has unlimited freedom, he who reverences Understanding as Brahma.’ ‘Is there, Sir, more than Understanding?’ ‘There is, assuredly, more than Understanding.’ ‘Do you, Sir, tell me it.’