Gita

In the Srimad Bhagavatam, Vyasadev lists various incarnations and finally concludes:

“All the lists of the incarnations of Godhead submitted herewith are either plenary expansions or parts of the plenary expansions of the Supreme Godhead, but Krishna is the Supreme Personality of Godhead Himself.”

When Lord Krishna descended on this planet, He displayed all the six opulences unlimitedly. We have seen many rich persons, many powerful persons, many famous persons, many beautiful persons, many learned and scholarly persons, and persons in the renounced order of life unattached to material possessions. But we have never seen any one person who is unlimitedly and simultaneously wealthy, powerful, famous, beautiful, wise and unattached, like Krishna in the history of humanity. Krishna the Supreme Personality of Godhead is a historical person who appeared on this earth 5,000 years ago. He stayed on this earth for 125 years and played exactly like a human being, but His activities were unparalleled. From the very moment of His appearance to the moment of His disappearance, every one of His activities is unparalleled in the history of the world, and therefore anyone who knows what we mean by Godhead will accept Krishna as the Supreme Personality of Godhead. No one is equal to the Godhead, and no one is greater than Him. That is the import of the familiar saying “God is great.”