"But if men do not believe in more than one life," Igraine protested, shaken, "how will they avoid despair? What just God would create some men wretched, and others happy and prosperous, if one life were all that they could have?" - Mists of Avalon, pg. 12
That is one of my favorite quotes that Igraine ever says. Really, it makes you think about other religions sometimes and how that's comforting to people. To know they only ever have one shot at life to live, learn, and love.