Bhakti Ratnavali - or A Necklace of Devotional Gems
Compiled by Vishnu Puri
An anthology of about four hundred verses selected by a medieval ascetic named Vishnu Puri, from the Srimad Bhagavata. In these verses we get a clear outline of the doctrine of Bhakti, both in its theory and practice, as conceived by the great devotional text, the Bhagavata.
Those who work at a thing heart and soul not only achieve success in it but through their absorption in that they also realize the supreme truth -- Brahman. Those who work at a thing with their whole heart receive help from God.
-Swami Vivekananda