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So when I heard that he wrote a book that addresses these questions--Why does God allow suffering in the world? How could a loving God send people to Hell? How can there only be one true religion?--I was extremely interested. The back of the book says that the issues covered are 'frequent doubts that skeptics, and even ardent believers, have about religion,' and that's true. I don't know how many conversations I have had about these things, particularly among Christians.
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I bring this up because I think it speaks to an important attribute of Tim Keller and an important aspect of learning - it is an ever-continuing conversation. Tim Keller isn't addressing these issues in a vacuum, and neither should we. He's drawing from the good research of others as well as the authority of the Bible, and I hope we can follow his lead when sorting all the harder (and easier, and all the in-between) issues of life.