Returning to Our Natural Consciousness
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famine, and so on, Kṛṣṇa can kill millions of people. He does not need to come here to kill these rascals, for they can be killed simply by His direction, or nature's law.  Sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā  ( Brahma-samhitā  5.44). Nature has so much power that it can create, maintain, and annihilate everything.  Sṛṣṭi  means “creation,”  sthiti  means “maintenance,” and  pralaya  means “destruction.” Nature can create, maintain, and also destroy. This material cosmic manifestation is being maintained by the mercy of nature, by which we are getting sunlight, air, and rain by which to grow our food so that we can eat and grow nicely. But nature is so powerful that at any time it can destroy everything simply by one strong wind. Nature is working under the direction of Kṛṣṇa ( mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram ). Therefore, if Kṛṣṇa wants demons killed, He can kill millions of them with merely one strong blast of nature's wind.
So to kill the demons Kṛṣṇa does not need to come. When He comes, He does so because He is requested by His devotees like Vasudeva and Devakī, as Kuntīdevī indicates by using the word  yācitaḥ , meaning “being prayed for.” Therefore the real cause of His coming is at the request of His devotees, but when He comes He simultaneously shows that He is prepared to kill anyone who is envious of His devotees. Of course, His killing and maintaining are the same because He is absolute. Those who are killed by Kṛṣṇa immediately attain salvation, which generally takes millions of years to get.
So people may say that Kṛṣṇa has come for this purpose or that purpose, but actually Kṛṣṇa comes for the benefit of His devotees. He always looks after the welfare of the devotees, and so from this instruction of Kuntī we should understand that we should always be concerned with how to become devotees. Then all good qualities will come upon us.
yasyāsti bhaktir bhagavaty akiñcanā sarvair guṇais tatra samāsate surāḥ (Bhāg. 5.18.12)
If one simply develops one's dormant, natural devotion for Kṛṣṇa, one will develop all good qualities.
Our devotion for Kṛṣṇa is natural. Just as a son has natural devotion to his father and mother, we have natural devotion to Kṛṣṇa. When there is danger, even materialistic scientists pray to God. Of course, when they are not in danger they defy God, and therefore danger is required in order to teach these rascals that there is God.  Jivera svarūpa