Why is this life, the only one we're certain is actually real, not enough for most people?

Why is this life, the only one were certain is actually real, not enough for most people?

They want there to be an "afterlife" as well. Why? Why can't they just make the most of this life, and consider themselves lucky that they were born at all?

Why is this life, the only one we're certain is actually real, not enough for most people?
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