It’s a simple fact that in the Greco-Roman world, the claims of Christianity were found every bit as implausible, if not more, than people find them now. So why did so many people believe?  Fortunately, we have a case study in Theophilus. How does a cultured, intellectually sophisticated person living in a culture that’s hostile to the basic claims of Christianity come to believe Christianity is true? The answer in a nutshell: the resurrection.  Whether we already believe or aren’t sure we believe, because of the resurrection we can know three things: 1) the truth is out there, 2) the truth is up there, and 3) the truth is in there.  This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on October 12, 2003. Series: The Necessity of Belief. Scripture: Acts 1:1-11. Today's podcast is brought to you by Gospel in Life, the site for all sermons, books, study guides and resources from Timothy Keller and Redeemer Presbyterian Church. If you've enjoyed listening to this podcast and would like to support the ongoing efforts of this ministry, you can do so by visiting https://gospelinlife.com/give and making a one-time or recurring donation.