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TEACHINGS OF QUEEN KUNTĪ
solution to the problems. Such a problem arose when Kaṁsa and others were ruling over the earth and the earth became too much overburdened by the misdeeds of the  asuras . Brahmājī, along with other demigods, prayed at the shore of the Kṣīrodaka Ocean, and they were advised of the descent of Kṛṣṇa as the son of Vasudeva and Devakī. So some people say that the Lord appeared because of the prayers of Brahmājī.
Kuntīdevī is describing the different statements of different persons about why Kṛṣṇa appears. Some say that He appeared at the request of Vasudeva and Devakī, and some say He appeared at the request of Brahmā.  Bhārāvatāraṇāyānye bhuvo nāva ivodadhau : “Some say that He appeared just to reduce the burden of the world, which was overburdened like a boat at sea.” When the world is overburdened, there must be war, pestilence, famine, epidemics, and so on. This is nature’s law.
The earth floats in space among many millions of other planets, all of them bearing huge mountains and oceans. It floats because Kṛṣṇa enters into it, as stated in  Bhagavad-gītā  ( gām āviśya ), just as He enters the atom. The earth is certainly not weightless; rather, it is very heavy. But it floats because the Supreme Spirit is within it.
Everything is lightened by the presence of spirit. One’s body will float in water as long as one is alive, but as soon as the spirit soul leaves, the body immediately sinks. As long as a child is alive we can take it along by one hand, but when the child is dead it is heavy. So now we are heavy, but when we are spiritually advanced we will be free from impediments. Now we cannot fly in the air, but the spirit soul is so light that when freed from the body it can go within a second to Vaikuṇṭhaloka, the spiritual world ( tyaktvā dehaṁ punar janma naiti mām eti ).
Why then does the world become overloaded? It becomes overloaded due to the presence of demons, those who are against devotional service. When mother earth feels this load to be too heavy, Kṛṣṇa comes just to unburden the earth. If a ship is overloaded, its position is very dangerous, for it may sink at any moment. Therefore when mother earth felt too uncomfortable because of being overloaded with demons ( sīdantyā bhūri-bhāreṇa ), she approached Brahmā, the chief living being within this universe. When there is a need, the chief personalities in the universe approach Brahmā, who approaches Viṣṇu to ask that He reduce whatever the burden is. Then Viṣṇu or Kṛṣṇa appears as an incarnation, as stated in  Bhagavad-gītā  (4.7):
yadā yadā hi dharmasya glānir bhavati bhārata