“Yada Yada Hi Dharmasya” sloka from Bhagvad Gita tells us Lord himself manifests to demolish the evil from the world whenever there is decline of righteousness and rise of evil… The sloka beautifully explains the purpose of each incarnation of Lord Vishnu in a wider manner.
YADA YADA HI DHARMASYA GLANIRBHAVATI BHARATA
ABHYUTTANAM ADHARMASYA TADAATMANAAM SRUJAMYAHAM.
O Bharata, whenever there is decline of righteousness and rise of evil, I will manifest Myself.
If there is majority of those who break the law of the land and/or the law of the divine, it leads to acts of evil. This in turn leads to doom of the society. Anarchy destroys the society. It be-comes act of self-destruction.
During such times, when there is great danger of anarchy and destruction of society, the Lord says “I Manifest.” (Srujami)
We need to understand this word clearly. It means “He” shows His presence. As God is considered to be good and divine, we can say “Good and Divine manifest” instead of saying “I manifest.” This in turn will kill evil and bring in turn peace and prosperity.
The next question is “which God” comes out and manifests?
There are two ways in which we can approach this issue of “Manifest.”
First one is to see the extra ordinary divinity in a human form who lived/lives/will live the life of a sthitaprajna/jivanmukta.
The second one is actual incarnation of Lord on earth who takes birth for namesake but actually out of His free will and not due to any vasanas from previous births like us.
The sastras clearly state that he who works selflessly and not looking for fruits of action is actually divinity on earth. He who dedicates his life for the welfare of all is said to be God on earth for that period.
During evil times there will arise someone who will reach Godhood by his actions and be-
comes God Himself and destroys evil. The history has many examples of men/women who are considered as Gods by generations that come later on.
As the learned scholars say, at every time adharma prevails and prevents man’s evolution, the Parabrahman embodies Himself.