One may raise the question how all three worlds became inundated with love of Krsna since Caitanya Mahaprabhu performed kirtana only in the Navadvipa area. The answer is that Lord Sri Caitanya Mahaprabhu is Krsna Himself. The entire cosmic manifestation results from the Lord's first setting it in motion. Similarly, since the sankirtana movement was first set in motion five hundred years ago by Sri Caitanya Mahaprabhu's desire that it spread all over the universe, the Krsna consciousness movement, in continuity of that same motion, is now spreading all over the world, and in this way it will gradually spread all over the universe. With the spread of the Krsna consciousness movement, everyone will merge in an ocean of love of Krsna.
CC adi 13.32