অনন্যমমতা বিষ্ণৌ মমতা প্রেমসঙ্গতা ।
ভক্তিরিত্যুচ্যতে ভীষ্মপ্রহ্লাদোদ্ধব-নারদৈঃ ॥ ৮ ॥
bhaktir ity ucyate bhisma-
ananya-mamata-having a sense of relationships with no others; visnau-in Lord Visnu, or Krsna; mamata-the sense of ownership; prema-saṅgata-endowed only with love; bhaktih-devotional service; iti-thus; ucyate-is said; bhisma-by Bhisma; prahlada-by Prahlada Maharaja; uddhava-by Uddhava; naradaih-and by Narada.
" 'When one develops an unflinching sense of ownership or possessiveness in relation to Lord Visnu, or, in other words, when one thinks Visnu and no one else to be the only object of love, such an awakening is called bhakti [devotion] by exalted persons like Bhisma, Prahlada, Uddhava and Narada.'
This verse, quoted from the Narada-pancaratra, is found in Bhakti-rasamrta-sindhu (1.4.2).