"Krsna can perfectly reciprocate one's loving propensities in different relationships called mellows or rasas. Basically there are twelve loving relationships. One can love Krsna as the supreme unknown, as the supreme master, the supreme friend, the supreme child, the supreme lover. These are the five basic love rasas. One can also love Krsna indirectly in seven different relationships, which are apparently different from the five primary relationships. All in all, however, if one simply reposes his dormant loving propensity in Krsna, then his life becomes successful. This is not a fiction but is a fact that can be realized by direct application. One can directly perceive the effects that love for Krsna has on his life."
(KRSNA,The Supreme Personality of Godhead, Preface)