Sankaracarya's Vivekachudamani 396

वक्तव्यं किमु विद्यतेऽत्र बहुधा ब्रह्मैव जीवः स्वयं

ब्रह्मैतज्जगदाततं नु सकलं ब्रह्माद्वितीयं श्रुतिः ।

ब्रह्मैवाहमिति प्रबुद्धमतयः संत्यक्तबाह्याः स्फुटं

ब्रह्मीभूय वसन्ति सन्ततचिदानन्दात्मनैतद्ध्रुवम् ॥

vaktavyaṃ kimu vidyate'tra bahudhā brahmaiva jīvaḥ svayaṃ

brahmaitajjagadātataṃ nu sakalaṃ brahmādvitīyaṃ śrutiḥ |

brahmaivāhamiti prabuddhamatayaḥ saṃtyaktabāhyāḥ sphuṭaṃ

brahmībhūya vasanti santatacidānandātmanaitaddhruvam |

(Sankaracarya's Vivekachudamani 396)

What is the use of enlarging upon this subject? The individual is nothing but the Brahman only; the whole expanse of this universe is nothing but Brahman only. Sruti points out Brahman as being non-dual; and it is an undeniable fact that those who are enlightened, who have established their identity with Brahman, and who have given up their associations with the outside world, live ever in union with Brahman, Eternal Knowledge, and Bliss.

In Vedas, it's clearly written that the Brahman is Supreme Lord Vishnu. We should have ekangika Bhakti like Hanuman, he doesn't love anyone other than Lord Rama. If we focus on the one love towards the Brahman and give up all our mundane love for this world, then our heart will be open for the Eternal and Blissful Supreme Lord(Brahman). Kindly give your 100% love for the Lord, instead of looking for temporary love in this material world. The Lord's love is eternal but material love will put us in a distressful situation.