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Unfortunately someone who died never came back to life to tell us what really happens... But I do believe in afterlife (it's part of my religion)... Hopefully you are NOT thinking about death... Well, if you are...BELIEVE ME... IT'S NOT WORTH IT... Life is very beautiful no matter what happens... Ending it is very foolish...
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Diwali is mostly celebrated for Rama's return to ayodhya after 14 years. And yes it is true that hindus of eastern india celebrate diwali in honor of goddess kali...