This is the first verse of the Siksastaka, written by Lord Caitanya. Srila Prabhupada writes: The Lord left only eight slokas of His instructions in writing, and they are known as the Siksastaka. All other literatures of His divine cult were extensively written by the Lord's principal followers, the six Gosvamis of Vrindavan, and their followers. The cult of Caitanya philosophy is richer than any other, and it is admitted to be the living religion of the day with the potency for spreading the universal religion.