Brahmā's one day, twelve hours, he... These four yugas, forty-three hundred thousands of years multiplied by one thousand. That is Brahmā's twelve days, uh, twelve hours. Now we can calculate his life. He'll live for one hundred years. So his twelve hours is millions of years. So still, he will die. Anything in this material world, it will not stay. Bhūtvā bhūtvā pralīyate (BG 8.19). Everything will be finished. Therefore even Brahmā's body is not eternal. What to speak of my body, your body, ant's body, his body... Sat. Sat means "that exists". Oṁ tat sat.
And cit. Cit means knowledge. So Kṛṣṇa's knowledge is perfect. Kṛṣṇa says, vedāham, vedāhaṁ samatītāni (BG 7.26). "I know past, present, and future." When Kṛṣṇa was questioned by Arjuna, Kṛṣṇa said that "Many millions of years ago, first of all, I spoke this science of Bhagavad-gītā or bhakti-yoga, to the sun-god." Imaṁ vivasvate proktaṁ vivasvān manave prāha. "I spoke, first of all, to Vivasvān, the Sun god." The Sun god's name is there, Vivasvān. Then Kṛṣṇa was questioned by Arjuna that "Kṛṣṇa, You and me, we are born very recently. How is that You say that You spoke to Sun god? That is millions and millions of years ago." So Kṛṣṇa answered, "Yes, I said. I remember. But you do not remember. You were also present." Kṛṣṇa and Arjuna, they're eternal friends. So whenever Kṛṣṇa appears, Arjuna also appears. Kṛṣṇa has got His associates. Arjuna is one of the associates. But the, that is the difference between living entity and God. God remembers and the living entity does not remember. He forgets. And another conclusion is: Why Kṛṣṇa remembers and why the living entity does not remember? The reason is that living entity changes the body, Kṛṣṇa does not change the body. Sambhavāmy ātma-māyayā (BG 4.6). When Kṛṣṇa appears, He appears in His original body, but because He looks like ordinary man, avajānanti māṁ mūḍhā mānuṣīṁ tanum āśritam (BG 9.11), the rascals and fools, they think Kṛṣṇa as ordinary man, human being.