Bhakti-yoga is the process of inner purification. The message of bhakti-yoga is that love is the most basic human emotion. In its purest form, love is cosmocentric and divinely inspired. But because of the intervention of the ego, love becomes egocentric, obstructing the free flow of love toward the Divine. Lust, anger, jealousy, and greed are the negative emotions created by the impure ego.

Swami Adiswarananda, The Four Yogas