This is the science. Yaṁ yaṁ vāpi smaran bhāvaṁ tyajaty ante kalevaram (BG 8.6), in the Bhagavad-gītā you will find, "At the time of death, as you are thinking, you will be carried to such body." This is the example. Just like this Bharata Mahārāja, such an exalted person, he had to become a deer. But because he was very spiritually advanced, although he became a deer, he was living with the saintly persons. Where saintly persons were sitting, he was sitting down there. He was eating the flowers and leaves which the saintly person left after worship. In this way, he had to wait for one life, and the next life, he became a son of a nice brāhmaṇa. So because he was remembering this different birth, he became very grave and silent. He was not talking with anyone. So it is very dangerous to contaminate. So he was known as Jaḍa Bharata. This story you will find in the Śrīmad-Bhāgavatam.
So just try to understand that death is there. You have to die. You may declare yourself, "I am very independent. I don't care for God or anyone," but God will not excuse you. You have to die. You will see God in the form of death. Just like Hiraṇyakaśipu, he is seeing. Prahlāda says: "My dear father, why don't you accept God?" "No no no. Who is God? I don't care for your God. You rascal boy, you are chanting Hare Kṛṣṇa." So, so God . . . the atheist may declare like that, "There is no God," but he will see God as death. That is compulsory. There is no excuse. So at the time of death, the mentality which you have created by practice, sadā tad-bhāva-bhāvitāḥ (BG 8.6), will act. This Hare Kṛṣṇa movement, this Kṛṣṇa consciousness movement, is simply educating people so that at the time of death one can remember Kṛṣṇa. That's all. This simple . . . and if he is fortunate enough to do this, immediately he is transferred to the Kṛṣṇaloka. Immediately, within a second. That is stated in the Bhagavad-gītā, tyaktvā dehaṁ punar janma naiti mām eti kaunteya (BG 4.9).
So why we should waste our time thinking so many nonsense things? Why not think of Kṛṣṇa, how beautiful He is, standing here with Rādhārāṇī? If we come here and take the impression and simply think of Him, our life is perfect. This is Kṛṣṇa consciousness. What is the difficulty and what is your loss? If you gain such big profit simply by thinking of Kṛṣṇa, why should you lose this opportunity, this human form of life? A cat cannot be educated. Dog cannot be educated. If I teach a dog, "My dear dog, please think of Kṛṣṇa," he is animal; it is not possible. But a human being, although at the present moment he is like a dog, but he can be trained to become a human being and think of Kṛṣṇa. That is possible. So we should take the opportunity. Bahūnāṁ janmanām ante (BG 7.19). This life is gotten after many, many births. We do not know. We have forgotten. This is the opportunity. And here is the proof, śāstra, that kṛṣṇāveśena tac-cittaḥ.
How Yamarāja, Vidura, returned to his place? Now, kṛṣṇāveśena tac-cittaḥ. He was fully absorbed in Kṛṣṇa thought. Not only Kṛṣṇa . . . you can go to Kṛṣṇaloka or any loka you desire. The yogīs, they also can do that, yoga practice. But that is not possible in this age. The so-called yoga practice going on simply bluff. Real yoga practice means one becomes so perfect that he will not die natural death. He will die when he likes. He will not be forced to die. When he thinks, "Now I am fully prepared. Now I shall leave this planet. I shall go to such-and-such planet, such-and-such loka," he will be immediately transferred. That is yoga practice. So that practice is not possible. Therefore still in India you will find many yogīs are there.