Tim Keller recently spoke at the Parliamentary Prayer Breakfast in the Houses of Parliament in London, and in the words of one reviewer, he "provided a masterclass in gracious apologetics." If you want to see how to speak of Christ to a secular culture, watch this 25-minute video. Keller discusses the beneficial role of Christianity as salt in a non-Christian culture, challenging secularism to consider the contradictions within its worldview, and challenging Christians to be the saints God has called us to be so that we might serve the world around us and woo them to our Lord and Savior. Very much worth your time.