Eschatology
Hinduism

The Vaishnavite tradition links contemporary Hindu eschatology to the figure of Kalki, the tenth and last avatar of Vishnu. Many Hindus believe that before the age draws to a close, Kalki will reincarnate as Shiva and simultaneously dissolve and regenerate the universe. Shaivites hold the view that Shiva is incessantly destroying and creating the world.

In Hindu eschatology, time is cyclic and consists of kalpas. Each lasts 4.1–8.2 billion years, which is a period of one full day and night for Brahma, who will be alive for 311 trillion, 40 billion years. Within a kalpa there are periods of creation, preservation and decline. After this larger cycle, all of creation will contract to a singularity and then again will expand from that single point, as the ages continue in a religious fractal pattern.

Within the current kalpa, there are four epochs that encompass the cycle. They progress from a beginning of complete purity to a descent into total corruption. The last of the four ages is Kali Yuga (which most Hindus believe is the current time), characterized by quarrel, hypocrisy, impiety, violence and decay. The four pillars of dharma will be reduced to one, with truth being all that remains. As written in the Gita:

Yadā yadā hi dharmasya glānirbhavati Bhārata Abhyutthānam adharmasya tadātmānam sṛjāmyaham O descendant of Bharata, whenever there is a decline of religion and an increase in irreligion, at that time I manifest My eternally perfect form in this mundane world.

At this time of chaos, the final avatar, Kalki, endowed with eight superhuman faculties will appear on a white horse. Kalki will amass an army to "establish righteousness upon the earth" and leave "the minds of the people as pure as crystal."

At the completion of Kali Yuga, the next Yuga Cycle will begin with a new Satya Yuga, in which all will once again be righteous with the reestablishment of dharma. This, in turn, will be followed by epochs of Treta Yuga, Dvapara Yuga and again another Kali Yuga. This cycle will then repeat until the larger cycle of existence under Brahma returns to the singularity, and a new universe is born. The cycle of birth, growth, decay, and renewal at the individual level finds its echo in the cosmic order, yet is affected by vagueries of divine intervention in Vaishnavite belief.
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