Excerpts from the discourse of our Sri Sri Muralidhara Swamiji
There are several ways of worship ('upãsana mãrga'). Bhagavãn accepts only 'sãttvic bhakti' ('satva' is quality of goodness/purity). Bhagavãn likes only that bhakti which is done with 'sãttvic hrudaya' (pure heart). Acquiring Bhakti is rare ('durlabam') indeed. Generally Vedantins would say, 'bhakti' is for those who are not 'adhikarris' (the deserving) for Jnana; one who is unable to leave for the forest with 'vairagya' (renunciation) and do tapas; one who is unable to make the mind one-pointed should take to Bhakti.'