Bhagavad Gita · 18.20

सर्वभूतेषु येनैकं भावमव्ययमीक्षते।अविभक्तं विभक्तेषु तज्ज्ञानं विद्धि सात्त्विकम्॥

sarva-bhūteṣhu yenaikaṁ bhāvam avyayam īkṣhate avibhaktaṁ vibhakteṣhu taj jñānaṁ viddhi sāttvikam

That knowledge by which one sees the one imperishable reality in all beings, undivided in the divided — know that knowledge to be sattvic.

— Bhagavad Gita 18.20

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)