One candle may light many other candles, yet each candle has the same intensity as the first. Yet the first still remains the original candle.
In the same way the Supreme Personality of Godhead expands himself in unlimited forms. He yet remains the cause of all causes.
In the Vedic scriptures the supreme original cause is known as Krsna because he posses unlimited transcendental qualities which attracts all living beings.
Five hundred years ago that same supreme cause Lord Sri Krsna appeared as Sri Caitanya Mahaprabhu and declared that the chanting of the Lords holy names of;

Hare Krsna, Hare Krsna
Krsna Krsna, Hare Hare
Hare Rama, Hare Rama
Rama Rama, Hare Hare