Krishna showed Arjuna his universal form to prove his divinity as the Supreme Lord. Arjuna was given divine vision to see Krishna's spectacular universal form which contained unlimited mouths, eyes, weapons, and emanated a light of hundreds of thousands of suns. Krishna did this to fulfill the criteria for anyone claiming to be God by demonstrating his control over the entire universe. In the present age, no one can legitimately claim to be an incarnation of Krishna unless they too show their universal form, as Krishna is the only God and all living beings remain eternal parts of him.