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Krṣṇa, the Supreme Personality of Godhead
But we have never seen any one person who is unlimitedly and simultaneously wealthy, powerful, famous, beautiful, wise and unattached, like Krṣṇa, in the history of humanity. Krṣṇa, the Supreme Personality of Godhead, is an 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 Krṣṇa 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.”
There are various classes of men in the world who speak of God in different ways, but according to Vedic literatures and according to the great  ācāryas , the authorized persons versed in the knowledge of God, in all ages, like  ācāryas  Śaṅkara, Rāmānuja, Madhva, Viṣṇusvāmī, Lord Caitanya and all their followers by discipline succession, all unanimously agree that Krṣṇa is the Supreme Personality of Godhead. As far as we, the followers of Vedic civilization, are concerned, we accept the Vedic history of the whole universe, which consists of different planetary systems called Svargalokas, or the higher planetary system, Martyalokas, or the intermediary planetary system, and Pātālalokas, or the lower planetary system. The modern historians of this earth cannot supply historical evidences of events that occurred before 5,000 years ago, and the anthropologists say that 40,000 years ago Homo sapiens had not appeared on this planet because evolution had not reached that point. But the Vedic histories, the  Purāṇas  and  Mahābhārata , relate human histories which extend millions and billions of years into the past.
For example, from these literatures we are given the histories of Krṣṇa’s appearances and disappearances millions and billions of years ago. In the Fourth Chapter of the  Bhagavad-gītā  Krṣṇa tells Arjuna that both He and Arjuna had had many births before and that He (Krṣṇa) could remember all of them and that Arjuna could not. This illustrates the difference between the knowledge of Krṣṇa and that of Arjuna. Arjuna might have been a very great warrior, a well-cultured member of the Kuru dynasty, but after all, he was an ordinary human being, whereas Krṣṇa, the Supreme Personality of Godhead, is the possessor of unlimited knowledge. Because He possesses unlimited knowledge, Krṣṇa has a memory that is boundless.
Krṣṇa’s knowledge is so perfect that He remembers all the incidences of His appearances some millions and billions of years in the past, but Arjuna’s memory and knowledge are limited by time and space, for he is