Bhagavad Gītā Chapter Six verse 20

yatroparamate cittaṃ niruddhaṃ yogasevayā |
yatra cāivātmanā ’tmānaṃ paśyann ātmani tuṣyati ||

ātman - essence; the highest personal principle of life; the individual soul, selfcitta - psyche (the totality of the human mind, conscious and unconscious); mind; heartnirodha - to contain, enclose; cover; confine, restrain; quell, surpress; quiesceca - andeva - thus

Commentaries and Reflections

Commentary by TKV Desikachar:

Before I inquire into who am I,
I must first look at who I am.