In the Western countries, when someone sees the cover of a book like Kṛṣṇa, he immediately asks, “Who is Kṛṣṇa? Who is the girl with Kṛṣṇa?” etc.
The immediate answer is that Kṛṣṇa is the Supreme Personality of Godhead. How is that? Because He conforms in exact detail to descriptions of the Supreme Being, the Godhead. In other words, Kṛṣṇa is the Godhead because He is all-attractive. Outside the principle of all-attraction, there is no meaning to the word “Godhead.” How is it one can be all-attractive? First of all, if one is very wealthy, if he has great riches, he becomes attractive to the people in general. Similarly, if someone is very powerful, he also becomes attractive, and if someone is very famous, he also becomes attractive, and if someone is very beautiful or wise or unattached to all kinds of possessions, he also becomes attractive. So from practical experience we can observe that one is attractive due to (1) wealth, (2) power, (3) fame, (4) beauty, (5) wisdom and (6) renunciation. One who is in possession of all six of these opulences at the same time, who possesses them to an unlimited degree, is understood to be the Supreme Personality of Godhead. These opulences of the Godhead are delineated by Parāśara Muni, a great Vedic authority.
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 Kṛṣṇa, in the history of humanity. Kṛṣṇa, 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 Kṛṣṇa 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 the Vedic literature and according to the great ācāryas, the authorized persons versed in the knowledge of God in all ages, like ācāryas Śaṅkara, Rāmānuja, Madhva, Viṣṇu Svāmī, Lord Caitanya and all their followers by disciplic succession, all unanimously agree that Kṛṣṇa 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 Svargaloka, or the higher planetary system, Martyaloka, or the intermediary planetary system, and Pātālaloka, 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, such as 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 Kṛṣṇa’s appearances and disappearances millions and billions of years ago. In the Fourth Chapter of the Bhagavad-gītā Kṛṣṇa tells Arjuna that both He and Arjuna had had many births before and that He (Kṛṣṇa) could remember all of them but Arjuna could not. This illustrates the difference between the knowledge of Kṛṣṇa 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 Kṛṣṇa, the Supreme Personality of Godhead, is the possessor of unlimited knowledge. Because He possesses unlimited knowledge, Kṛṣṇa has a memory that is boundless.