The word agādha-bodham, meaning "full of unlimited knowledge," is significant in this verse. The Lord's knowledge is unlimited, and therefore one cannot touch where it ends, just as one cannot measure the ocean. What is the extent of our intelligence in comparison to the vast expanse of water in the ocean? On my passage to America, how insignificant the ship was, like a matchbox in the midst of the ocean. Kṛṣṇa's intelligence resembles the ocean, for one cannot imagine how vast it is. The best course, therefore, is to surrender to Kṛṣṇa. Don't try to measure Kṛṣṇa.
The word advayam, meaning "one without a second," is also significant. Because Brahmā was overcast by Kṛṣṇa's māyā, he was thinking himself the Supreme. In the material world, everyone thinks, "I am the best man in this world. I know everything." One thinks, "Why should I read Bhagavad-gītā? I know everything. I have my own interpretation." Brahmā, however, was able to understand that the Supreme Personality is Kṛṣṇa. Īśvaraḥ paramaḥ kṛṣṇaḥ (BS 5.1). Another of Kṛṣṇa's names, therefore, is parameśvara.
Now Brahmā saw Kṛṣṇa, the Supreme Personality of Godhead, appearing as a cowherd boy in Vṛndāvana, not demonstrating His opulence but standing just like an innocent boy with some food in His hand, loitering with His cowherd boyfriends, calves and cows. Brahmā did not see Kṛṣṇa as catur-bhuja, the opulent Nārāyaṇa; rather, he simply saw an innocent boy. Nonetheless, he could understand that although Kṛṣṇa was not demonstrating His power, He was the same Supreme person. people generally do not appreciate someone unless he shows something wonderful, but here, although Kṛṣṇa did not manifest anything wonderful, Brahmā could understand that the same wonderful person was present like an ordinary child, although He was the master of the whole creation. Thus Brahmā prayed, govindam ādi-puruṣaṁ tam ahaṁ bhajāmi: "You are the original person, the cause of everything. I bow down to You." This was his realization. Tam ahaṁ bhajāmi. This is what is wanted. Vedeṣu durlabham: one cannot reach Kṛṣṇa merely by Vedic knowledge. Adurlabham ātma-bhaktau: but when one becomes a devotee, then one can realize Him. Brahmā, therefore, became a devotee. In the beginning he was proud of being Brahmā, the lord of the universe, but now he understood, "Here is the Lord of the universe. I am simply an insignificant agent. Govindam ādi-puruṣaṁ tam ahaṁ bhajāmi."
Kṛṣṇa was playing like a dramatic actor. Because Brahmā had some false prestige, thinking that he had some power, Kṛṣṇa showed him his real position. A similar incident occurred when Brahmā went to see Kṛṣṇa in Dvārakā. When Kṛṣṇa's doorman informed Lord Kṛṣṇa that Lord Brahmā had arrived, Kṛṣṇa responded, "Which Brahmā? Ask him which Brahmā." The doorman relayed this question, and Brahmā was astonished. "Is there another Brahmā besides me?" he thought. When the doorman informed Lord Kṛṣṇa, "It is four-headed Brahmā," Lord Kṛṣṇa said, "Oh, four-headed. Call others. Show him." This is Kṛṣṇa's position. For Kṛṣṇa the four-headed Brahmā is insignificant, to say nothing of "four-headed scientists." Materialistic scientists think that although this planet earth is full of opulence, all others are vacant. Because they simply speculate, this is their scientific conclusion. But from the Bhāgavatam we understand that the entire universe is full of living entities everywhere. Thus it is the folly of the scientists that although they do not know anything, they mislead people by presenting themselves as scientists, philosophers and men of knowledge.