The Christians say, "God is great." The Muslim also say that allahu akbar. That is also same meaning. The Vedic literature also says Brahman, Parabrahman. Brahman means the greatest. Bṛhatvāt bṛhannatvād iti brahma. Brahman means because it is very, very great; and not only great, it is becoming greater and greater. Bṛhannatvāt. So the great understanding, greatness understanding, of Kṛṣṇa or the Absolute Truth is accepted everywhere in civilized human society. But how God is great, that you can find in the Vedic literature. Simply to know God is great . . . just like if you . . . everyone knows that he has got a father. That is not difficult. Anyone who is in this material world, in material world or spiritual world, there is a father. Everyone, father, knows that. But who is my father, how he is, how great he is, what is his qualification, what does he do, what is his father's name, where is his address—that you can understand from Bhagavad-gītā. Therefore it is essential that everyone should read Bhagavad-gītā. Simply to know God is great, that is also good. He is accepting the greatness of God. But if you want to know in detail how great He is, to what extent He greatly is, how the actions of His greatness are going on, how His activities of greatness are going on, then you read Bhagavad-gītā.
Bhagavad-gītā says that mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya (BG 7.7). Kṛṣṇa says, "There is no more greater factor than Me." Everyone knows God is great. "Great" means everyone is small; He is great. Nobody is equal to Him. Nobody is greater than Him. That is the meaning of greatness.