Bhagavad Gita 10.15

स्वयमेवात्मनाऽत्मानं वेत्थ त्वं पुरुषोत्तम।भूतभावन भूतेश देवदेव जगत्पते॥

svayamevātmanā'tmānaṃ vettha tvaṃ puruṣottama |bhūtabhāvana bhūteśa devadeva jagatpate ||

Verily, Thou Thyself knowest Thyself by Thyself, O Supreme Person, O source and Lord of all beings, O God of gods, O ruler of the world!

You alone know Yourself, by the power of Your Self; You are the Supreme Spirit, the Source and Master of all being, the Lord of Lords, the Ruler of the Universe.

Our plain-language meaning of this verse is waiting for scholar review.