Chandogya Upanishad 7.6.2

7.6.2

sa yo dhyānaṃ brahmety upāste \
yāvad dhyānasya gataṃ tatrāsya yathākāmacāro bhavati yo dhyānaṃ brahmety upāste \
asti bhagavo dyānād bhūya iti \
dhyānād vāva bhūyo 'stīti \
tan me bhagavān bravītv iti \\706.2\

2. He who reverences Meditation as Brahma—as far as Meditation goes, so far he has unlimited freedom, he who reverences Meditation as Brahma.’ ‘Is there, Sir, more than Meditation?’ ‘There is, assuredly, more than Meditation.’ ‘Do you, Sir, tell me it.’