The Mukhya Upaniṣads

Īśa · The Whole World in the Light of the Self

Mantra 7

यस्मिन्सर्वाणि भूतान्यात्मैवाभूद्विजानतः ।तत्र को मोहः कः शोक एकत्वमनुपश्यतः ॥ ७ ॥

In plain words

For the one who knows, in whom all beings have become the Self alone, what delusion and what grief can remain for one who beholds oneness?