Kena (Talavakāra) Upaniṣad 2.1

2.1

yadi manyase suvedeti
daharam evāpi nūnaṃ tvaṃ vettha brahmaṇo rūpaṃ
yad asya tvaṃ yad asya deveṣv
atha nu mīmām̐syam eva te
manye viditam

9 (1). [Teacher:] If you think ‘I know well,’ only very slightly now do you know!—a form of Brahma!—what thereof is yourself, and what thereof is among the gods! So then it is to be pondered upon (_mīmāṃsyam_) indeed by you. [Pupil:] I think it is known.