Śrīmad-Bhāgavatam gives a general description. What is that? Sa vai puṁsāṁ paro dharmaḥ: "That is the best form of religion for a person." What is that? Sa vai puṁsāṁ paro dharmaḥ: "That is the best form of religious principle," yato bhaktir adhokṣaje, "by performing which you become a devotee of the adhokṣaja."
Adhokṣaja means the Supreme Personality of Godhead. The real, literal meaning of adhokṣaja: adhaḥ—this is Sanskrit word—adhaḥ means made down, and akṣaja, akṣaja means sense perception, knowledge acquired by sense perception. So adhokṣaja means the Supreme Personality of Godhead which cuts down all kinds of sense perceptional activities.
Just like the mental speculators, they are making research, "What is God?" Speculating. You have got experience, they are writing volumes of books simply by speculation. So to them, this word is the answer. What is that? Adhah-kṛtaṁ akṣajaṁ jñānam: "You may go on speculating for many thousands of years, still you will be cut down. You will never be able to understand what is God." Therefore this particular word is used, adhokṣaja. Adhah-kṛtaṁ akṣajaṁ jñānaṁ yatra tatram. This is the Sanskrit definition of this word.
So God's another name is Adhokṣaja. Just like "Kṛṣṇa" is one name; "God" is general name. "God is great," and . . . we generally define like that, "God is great." But we do not know how great He is. That definition is given perfectly: "Kṛṣṇa." If you want a perfect definition of the word God, then it is Kṛṣṇa. Because Kṛṣṇa means all-attractive. All-attractive. Unless one is all-attractive, how one can be God, the great? The general definition is "the great." But this is a nicer definition, "Great" means all-attractive.
Suppose you are very great in this city, just like you are Mr. Kennedy or you are Mr. Rockefeller or Mr. Ford. Just like in your country there are so many big men, by their richness—because they are very rich; they have got money—so they are attractive. So money is one of the feature of attraction.
Therefore God must be the supreme wealthy person. Otherwise He is not God. Another attraction is beauty. So God must be the most beautiful. You have seen the picture of Kṛṣṇa so many times. Perhaps you are convinced that you have never seen such a beautiful picture, although He's little blackish.