From "The Human Condition: A User's Manual" by Arnold Kunst
If Heaven were some plastic, pretend thing, it wouldn’t take any more trouble to achieve it than, say, picking up the morning paper. But if it’s anything like it’s supposed to be, I think we’d better prepare to do battle. It’s a prize eminently worth having, but only when we’ve successfully stormed the battlements. In fact, maybe it’s part of the plan that we’ve got to take hell to earn Heaven.