Chāndogya Upaniṣad 7.4.3

7.4.3

sa yaḥ saṃkalpaṃ brahmety upāste \
kḷptān vai sa lokān dhruvān dhruvaḥ pratiṣṭhitān pratiṣṭhito 'vyathamānān avyathamāno 'bhisidhyati \
yāvat saṃkalpasya gataṃ tatrāsya yathākāmacāro bhavati yaḥ saṃkalpaṃ brahmety upāste \
asti bhagavaḥ saṃkalpād bhūya iti \
saṃkalpād vāva bhūyo 'stīti \
tan me bhagavān bravītv iti \\704.3\

3. He who reverences Conception as Brahma—he, verily, attains the Conception-worlds; himself being enduring, the enduring worlds; himself established, the established worlds; himself unwavering, the unwavering worlds. As far as Conception goes, so far he has unlimited freedom, he who reverences Conception as Brahma.’

‘Is there, Sir, more than Conception?’

‘There is, assuredly, more than Conception.’

‘Do you, Sir, tell me it.’