There are uncountable reasons for the descension of God.
Thus, it is pointless to say that the purpose of God’s descension is limited to a specific reason. People have given various reasons based on what appeals to them. But, I would say that the most important reason for the descension of God is only His causeless Grace. God, Who is fully satisfied within Himself, and Who isatmaram-poornkam, has nothing to gain from anyone. He cannot have any kind of desire. Thus His each and every action is only for the benefit of others. God’s nature of causelessly showering His Grace upon the souls is also well-known in the world. It is this nature which causes His descension.
It is very simple to explain how He showered His causeless Grace upon the souls in His descension as Krishn. There are rigid qualifications to enter the path of gyanor non-dualistic devotion to the impersonal aspect of God (nirakar brahm). Such a person who fulfills these qualifications is so rare that he may be only one in millions. Shankaracharya describes in his writings that without devotion to the supreme personality of God, Shree Krishn, heart can never be purified. Without purifying the heart, how could a person become qualified to enter the path ofgyan? Even if a person does become qualified, only a mere handful of such souls could actually attain liberation. Therefore, because of His nature of being causelessly Gracious, God descended in this world and, during that time, He revealed His innumerable names, virtues, and His leelas. Thus, by taking their help, uncountable sinful, mayic souls cross the ocean of maya and receive Divine love. There are examples of souls like Valmiki. He could not even repeat the name of Bhagwan Ram. So, he repeated the name backwards. Even then, through the strength of the Divine name, he became a great brahmrishi. In this context Ved Vyasji says in the Bhagwatam (1/8/35),
That because of our interaction from uncountable lifetimes with the material world, the natural inclination of the mind is towards the material world. God therefore descends in this world, and reveals the Divine environment and His Divine pastimes, which become the means of Divine attainment for uncountable souls.
Another reason for the descension of God that is even more dear to me is,
“Although the paramhansas were already absorbed in the Bliss of the impersonal aspect of Divinity, God appeared in this world in His eternal Divine form to immerse them in the Bliss of Divine love.”
There are examples of great paramhansas like Sanakadi, Janak, Shukdev and others, who abandoned their impersonal Bliss and became absorbed in the Bliss of the personal form of God. Just think, even after knowing this fact, some ignorant people still question about the eternity of the personal form of God. Had there been no descension (avatar), the followers of the path of impersonal Divinity would have loudly declared that the personal form of God does not exist.
