So do you think that Kṛṣṇa is playing joke or speaking something lie, that he said to Vivasvān, the present presiding deity? No, that is not possible. Actually He has spoken. And Kṛṣṇa . . . one . . . others may think of Kṛṣṇa, avajānanti māṁ mūḍhāḥ (BG 9.11). Rascals and fools may think of Kṛṣṇa as ordinary man. But in India the great ācāryas, just like Śaṅkarācārya, Rāmānujācārya, Madhvācārya, Lord Śrī Caitanya Mahāprabhu—practically these ācāryas are guiding the whole destiny of the Hindu world—they have all accepted Kṛṣṇa, the Supreme Personality of Godhead. So whatever Kṛṣṇa is speaking, that is right.
Now, you can understand that if Kṛṣṇa spoke to the sun-god, and the sun-god spoke to his son Manu, then how old is this science of Bhagavad-gītā. Apart from sun-god's duration of age, if we simply take the present age, Vaivasvata Manu . . . Vaivasvata Manu, the age of Vaivasvata Manu is seventy-one multiplied by forty-three hundred thousands of years.
Forty-three hundred thousands of years multiplied by seventy-one. It is a very long duration of life. Now, at the present moment the Vivasvān . . . the Vaivasvata Manu's age is half-finished. That means the number, the numerical strength, forty-three hundred thousands of years into seventy-one, divide by two. So long years Bhagavad-gītā was spoken.
So Bhagavad-gītā is not a new thing, a new adventure. And the person who spoke Bhagavad-gītā to the sun-god, does it mean that He left something to be commented by some . . . these mundane man to understand the meaning of the Bhagavad-gītā? Such a great personality, the Supreme Personality of Godhead, He told something which is to be understood by the interpretation of a mundane scholar? Do you think it is reasonable? No. Whatever He spoke, that is all right. And that is clear. There is no question of interpreting in a different way.
Just like here, "The Blessed Lord said: 'I instructed this imperishable science of yoga to the sun-god Vivasvān.' " What is difficulty there? Is there any word which you cannot understand? Is anyone here who cannot understand these lines? It is clear. "The Blessed Lord said, 'I instructed this imperishable science of yoga to the sun-god Vivasvān.' " Everyone can understand that Kṛṣṇa instructed this science of Bhagavad-gītā, or the yoga of Bhagavad-gītā, to the sun-god, whose name is Vivasvān. It is clear. How you can interpret?
Now the thing is, unless I think of Kṛṣṇa that, "He is an ordinary man. How He could say to the sun-god Vivasvān?" then the interpretation is required. But that sort of thinking is not bona fide, because if you want to study Bhagavad-gītā, you have to take the words of Bhagavad-gītā. The Blessed Lord . . . He is Lord. He can say.