Kauṣītaki Upaniṣad 3.7.24-27

3.7.24

nāham etam ānandaṃ na ratiṃ na prajātiṃ prājñāsiṣam iti /

For truly, apart from intelligence the generative organ would not make cognizant of any bliss, delight, and procreation whatsoever. 'My mind was elsewhere,' one says; 'I did not cognize that bliss, delight, and procreation.'

3.7.25

na hi prajñāpetau pādāv ityāṃ kāñcana prajñāpayeyātām /

For truly, apart from intelligence the two feet would not make cognizant of any going whatsoever. 'My mind was elsewhere,' one says; 'I did not cognize that going.'

3.7.26

anyatra me mano 'bhūd ity āha /

3.7.27

nāham etām ityāṃ prājñāsiṣam /