Bhagavad Gita Chapter 18, Verse 20

सर्वभूतेषु येनैकं भावमव्ययमीक्षते | अविभक्तं विभक्तेषु तज्ज्ञानं विद्धि सात्त्विकम् ||

sarvabhūteṣu yenaikaṁ bhāvam avyayam īkṣate avibhaktaṁ vibhakteṣu taj jñānaṁ viddhi sāttvikam

That knowledge by which one sees the one indestructible essence in all beings, undivided in the divided, know that knowledge to be sattvic.

Krishna begins explaining the three kinds of knowledge, starting with sattvic knowledge. 'Sarvabhūteṣu yenaikaṁ bhāvam avyayam īkṣate'—that knowledge by which (yena) one sees (īkṣate) the one (ekam) indestructible (avyayam) essence (bhāvam) in all beings (sarvabhūteṣu). 'Avibhaktaṁ vibhakteṣu'—undivided (avibhaktam) in the divided (vibhakteṣu). 'Taj jñānaṁ viddhi sāttvikam'—know (viddhi) that knowledge (tat jñānam) to be sattvic (sāttvikam). This is sattvic knowledge: seeing the one essence, the indestructible Self, in all beings. Despite apparent divisions (different bodies, forms, names), you see the undivided essence. This is the knowledge that recognizes unity in diversity, the eternal in the temporary, the one in the many. This is the highest kind of knowledge—seeing the Supreme in all, recognizing the divine essence in everything.