Kṛṣṇa says, Veda says that na tasya kāryaṁ karaṇaṁ ca vidyate. "The Supreme Lord God has nothing to do." Why He shall do? So . . . and again, we see that Kṛṣṇa, since the day of His appearance at His maternal uncle's prison till to His going back to His own home, He was always active. Active means especially in killing the demons. But such demons could be killed without the presence of the Supreme Personality of Godhead. If there is little earthquake, millions of demons can be killed. It is not very difficult job. If the Pacific Ocean overfloods this city, millions of people can be killed. If there is a war, millions of people can be killed. If there is epidemic, millions of men can be killed. So killing the demons, for that purpose He does not come, Kṛṣṇa. Rather, Kṛṣṇa's many agents, they can kill such demons without any difficulty.
But He comes, paritrāṇāya sādhūnām (BG 4.8). Just like Lord Nṛsiṁha appeared not to kill the demon Hiraṇyakaśipu—he could be killed otherwise—but He appeared for Prahlāda. Prahlāda Mahārāja, he was being so much teased and so much tortured, He could not tolerate it. So He wanted to show His devotee that, "I shall kill your torturer before you." That is the purpose. So He did not appear for killing Hiraṇyakaśipu; He appeared to give encouragement to Prahlāda Mahārāja. As He says, kaunteya pratijānīhi na me bhaktaḥ praṇaśyati (BG 9.31). He asked Arjuna to declare, "My dear Arjuna, you declare that My devotee will never be vanquished." So therefore He comes.
So these are the understanding of the Supreme Personality of Godhead in toto. So if we discuss about kṛṣṇa-kathā, the words of Kṛṣṇa . . . there are two books, words of Kṛṣṇa. One, Bhagavad-gītā. Every Vedic literature is kṛṣṇa-kathā, but these two books especially, kṛṣṇa-kathā. Bhagavad-gītā, Kṛṣṇa is directly speaking, and Śrīmad-Bhāgavatam, directly speaking about Kṛṣṇa. Both of them are kṛṣṇa-kathā. So therefore here it is said that uttama-śloka-vārtayā. Vārtā means message, words. So if we pass our time simply by reading and talking about Kṛṣṇa, then the sun will not be able to take away our life. This is the secret. If you want to become immortal, then you always be engaged in kṛṣṇa-kathā. Always, twenty-four hours, always think of Kṛṣṇa. This is Kṛṣṇa consciousness.
So everyone is dying, but those who are engaged in kṛṣṇa-kathā, in Kṛṣṇa consciousness, those who are busy in Kṛṣṇa's business, they are not dying. They are living. How? Because ordinary man, his duration of life, span of life, is being taken away by the sun rising and sunset every day. If a man is fifty years old, that means . . . he has to live for eighty years. So fifty years duration has already been taken away by the sun. Fifty years old means that fifty years of time has already been taken away by the sun. It will never come back. "But what about the devotees? He is also the same. His, also, life is being taken away?" No. His life is not being taken away, because he is going to live. Superficially we see that the body of a devotee is also taken away. But this is not the real body. Real body is the spiritual body.