Yoga Sūtra Chapter Four verse 4

निर्माणचित्तान्यस्मितामात्रात् ॥४॥

nirmāṇa-cittāni-asmitā-mātrāt ||4||

Psyches are created only from the sense of ‘I’ am-ness.

nirmāṇa - createdcitta - psyche; mind; heartasmitā - the sense of 'I' am-nessmātra - only