Bhagavad Gita Chapter 8, Verse 22
पुरुष: स पर: पार्थ भक्त्या लभ्यस्त्वनन्यया | यस्यान्त:स्थानि भूतानि येन सर्वमिदं ततम् ||
puruṣaḥ sa paraḥ pārtha bhaktyā labhyas tv ananyayā yasyāntaḥ-sthāni bhūtāni yena sarvam idaṁ tatam
O Arjuna, that Supreme Person, in whom all beings reside and by whom this entire universe is pervaded, is attainable only through exclusive devotion.
Krishna concludes Chapter 8 with the final teaching: 'Purushah sa parah partha bhaktya labhyas tv ananyaya'—that (sah) Supreme (parah) Person (purushah), O Arjuna (partha), is attainable (labhyas) only (tu) through exclusive (ananyaya) devotion (bhaktya). 'Yasyantahsthani bhutani yena sarvam idam tatam'—in whom (yasya) all beings (bhutani) reside (antahsthani), and by whom (yena) this entire (sarvam idam) universe is pervaded (tatam). This is the culmination: the Supreme Person who pervades everything and in whom all beings reside is attainable only through exclusive devotion. Not through knowledge alone, not through action alone, but through exclusive devotion. This is the path: constant remembrance with exclusive devotion leads to the Supreme Person. This is what Chapter 8 teaches: the importance of remembering the Supreme at death, and the path to attain Him—exclusive devotion through constant remembrance.