Conversion is a radical change of life. And in its early days, Christianity grew through conversions. It spread so rapidly that it changed a hostile society completely. What does it mean to become a Christian? By looking at the conversions in Acts, we can see what Christianity really is.  In this passage, the conversion of an Ethiopian, we learn three things: 1) who converts, 2) the context of conversion, and 3) the key instrument conversion uses. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 16, 2003. Series: The Necessity of Belief. Scripture: Acts 8:26-40. 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.