Nectar of Devotion — The Ocean of Rasa
The Bhakti-rasamrta-sindhu, presented in English as the Nectar of Devotion, is the lawbook of devotional service. It describes the stages by which a fortunate soul rises from faith to the perfection of divine love.
The Definition of Pure Bhakti
anyābhilāṣitā-śūnyaṁ jñāna-karmādy-anāvṛtam
Favorable devotional service, uncovered by knowledge and fruitive action, and free from all other desires.
Pure devotion is service rendered to Krishna with a favorable attitude, free from the desire for anything other than his pleasure. This is the standard by which all practice is measured.