The Mukhya Upaniṣads

Īśa · The Whole World in the Light of the Self

Mantra 6

यस्तु सर्वाणि भूतान्यात्मन्येवानुपश्यति ।सर्वभूतेषु चात्मानं ततो न विजुगुप्सते ॥ ६ ॥

In plain words

Whoever sees all beings in the Self alone, and the Self in all beings, no longer shrinks away from anything.