Then the most authentic evidence is śruti, out of three evidences, the śruti, hearing from the authority. Just like Kṛṣṇa says, imaṁ vivasvate yogaṁ proktavān aham avyayam (BG 4.1). So Kṛṣṇa says... Kṛṣṇa is the authority, best authority, supreme authority. So we can understand from His speech that in the sun planet there is a king whose name is Vaivasvata. And Kṛṣṇa says that "I spoke to Vivasvān." So Vivasvān... Now, nobody can say when the sun planet was created. But we can calculate, as it is said, vivasvān manave prāhuḥ, that Vivasvān, he explained to Manu. So Manu's age we can calculate. Manu's age, there are seventy-two Manus in one day of Brahmā. And the one day of Brahmā means forty-three hundred thousands of years multiplied by one thousand and divided by seventy-two. Then we can immediately calculate what is Manu's age. So by Manu's age we can calculate that forty millions of years ago Kṛṣṇa spoke to the sun-god about this philosophy. This is called śruti. The exact calculation, by śruti you can make. So śruti-pramāṇa.
So here it is said deva-pravarāḥ. The Viṣṇudūtas, they are coming from Vaikuṇṭha, so beautiful, so nicely dressed, four-handed with ornaments, helmet, garland. So they have experience of the demigods, but the Viṣṇudūtas do not belong to this material world. They belong to the spiritual world. Therefore they are addressed deva-pravarāḥ, "More than the demigods," deva-pravarāḥ. They are very much pleased to see the Viṣṇudūtas, although argument is going on. Immediately after see them, they are, the Yamadūtas, they are very much pleased upon them, that "They are not ordinary living being." And with four hands. Therefore they are addressing, deva-pravarāḥ. Yatheha deva-pravarās trai-vidhyam upalabhyate. Vidhi, tri-vidha. Tri-vidha means three varieties. Vidha mean variety, and tri means three. So from tri-vidha it is said, trai-vidhyaṁ bhavaḥ.
So trai-vidhyam, three kinds. Three kinds. Here also, in this world, we see varieties of men, varieties of animals, varieties of trees, varieties of insects-many varieties. It is already informed that altogether, within this universe, there are 8,400,000 varieties of life. Life is one. The varieties means body. Just like we are sitting. Every one of us has got a particular type of body. You will never find that this man or this boy or this girl exactly of the same bodily feature. Varieties. So altogether there are classes, or species, 8,400,000. So those who are experienced, thoughtful men, by reading scripture... Just like Kṛṣṇa says that imaṁ vivasvate yogaṁ proktavān. He said to the sun-god or the president of the sun planet, Vivasvān. So that means that is also a similar place like this. You cannot say there is no living entity. Anumīyate. That is intelligence. Because this planet is also one of the material things, everything is made here, earth, water, air, fire. So somewhere some element is very prominent. Here in this planet the earth is prominent. In the sun planet the fire is prominent. But that does not mean there is no living entity. This is foolishness. Anumīyate. This is intelligence, that everything within this universe, this material universe, everything is made of these five elements: earth, water, fire, air, sky. We see here practically that the aquatics, they have got a different type of body, and they are very peacefully living in the water. And if you are thrown in the water, you will die. And the fish is taken from the water; he will die. So land, water, fire—the particular type of body.