Just like Kuntī says that apare vasudevasya devakyāṁ yācito 'bhyagāt (SB 1.8.33). Vasudeva and Devakī prayed to the Supreme Personality of Godhead that "We want a son like You. That is our desire." Although they were married, they were . . . they did not beget any child. They engaged themselves in tapasya, severe tapasya. So Kṛṣṇa came before them: "What do you want?" "Now, we want a child like You." Therefore here it is said, vasudevasya devakyāṁ yācitaḥ. Yācitaḥ. "Sir, we want a son like You." Now what . . . where there is possibility of another God? Kṛṣṇa is God. God cannot be two. God is one. So how there can be another God to become the son of Vasudeva and Devakī? Therefore God agreed that "It is not possible to find out another God. Then I shall become your son."
So people say that because Vasudeva and Devakī wanted Kṛṣṇa as their son, He appeared. Kecit. Somebody says. Vasudevasya devakyāṁ yācitaḥ. Being requested, being prayed for, abhyagāt, He appeared. Ajas tvam asya kṣemāya vadhāya ca sura-dviṣām. Others says the same thing, as I was explaining. Paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām (BG 4.8). Actually Kṛṣṇa comes to pacify His devotee. Just like He appeared to pacify, to satisfy His devotee, Vasudeva and Devakī. But when He comes, He does the other business. What is that? Vadhāya ca sura-dviṣām. Vadhāya means killing. Sura-dviṣām.
There is a class of men, they are called asuras. They are sura-dviṣām. They are always envious of the devotees. They are called demons. Just like Prahlāda Mahārāja and his father, Hiraṇyakaśipu. Hiraṇyakaśipu is the father of Prahlāda Mahārāja, but because Prahlāda Mahārāja was a devotee, he became envious. That is the nature of the demon. So much so envious that he was prepared to kill his own son. The only fault is that little boy, he was chanting Hare Kṛṣṇa. That is his fault. The father could not. Therefore they are called sura-dviṣām, always envious of the devotees. Demon means always envious of the devotee.
This material world is so nuisance place that . . . just you have got a very nice example: just like Jesus Christ, Lord Christ. So what was his fault? But the sura-dviṣām, the envious person, killed him. And if we find, if we analyze, what is the fault of Jesus Christ, there is no fault. The only fault he was preaching about God. And still we find so many enemies. He was cruelly crucified. So you'll always find this, sura-dviṣām. So Kṛṣṇa comes to kill these sura-dviṣām. Therefore vadhāya ca sura-dviṣām. These envious persons are killed.
But this killing business can be done without the presence of Kṛṣṇa. Because there are so many natural forces—war, pestilence, famine, anything—just set on working. Millions of people can be killed. So Kṛṣṇa does not require to come here to kill these rascals. They can be killed simply by Kṛṣṇa's direction, nature's law. Prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ (BG 3.27). Sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā (Bs. 5.44). The nature has got so much power that it can create, it can maintain, it can annihilate, dissolute, everything. Nature is so powerful. Sṛṣṭi-sthiti-pralaya. Sṛṣṭi means creation, and sthiti means maintenance, and pralaya means destruction. These three things nature can do.