Bhagavad Gita 10.15
स्वयमेवात्मनाऽत्मानं वेत्थ त्वं पुरुषोत्तम। भूतभावन भूतेश देवदेव जगत्पते॥
swayam evātmanātmānaṁ vettha tvaṁ puruṣhottama bhūta-bhāvana bhūteśha deva-deva jagat-pate
Translation
Thyself indeed knowest Thyself by Thyself, O Purushottama; Source of beings, Lord of beings, Shining One of Shining Ones, Ruler of the world!
What it means
You alone know Yourself by Yourself, supreme Person, source and Lord of beings, God of gods, ruler of the world. Self-knowledge belongs to the Self-luminous. Every external measure falls short by definition.
Try this today
Self-knowledge of the source is the source's alone - the student can only receive, not derive it.
Something to reflect on
What do I accept can only be known from the inside?
Read it in Yathora