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Now You Are Light

March 12, 2025

The essence of Christianity is arguing with yourself. What makes you an effective Christian is that you’re continually arguing with yourself, and you’re winning the argument.

Because of what Christ did, God can restore the world and restore everything if we come to him through Christ. And in Ephesians 5, Paul uses the imagery of darkness and light to argue with us about how we need to be living: “For you were once darkness, but now you are light in the Lord.” If you don’t get the verse right, you’ll never win the argument.

To understand this, we have to understand what the Bible means when it talks about light and darkness in spiritual terms. It means: 1) God is truth, 2) God is righteousness, and 3) a mark of somebody who has crossed from darkness to light is that they become more of a servant.

This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on May 26, 1991. Series: Christian Lifestyle. Scripture: Ephesians 5:8-14.

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.

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Strengthen Your Devotional Time

Have you struggled to experience a meaningful devotional life? Tim and Kathy Keller’s 365-devotional book, "The Songs of Jesus", is a great way to establish a daily rhythm of meditating on God’s word by reading through passages from the book of Psalms. Even if you already spend time every day reading God’s word, "The Songs of Jesus" can help you grow to a new level of intimacy with God. This devotional book is our thanks for your gift this month to support the ministry of Gospel in Life.

About Gospel in Life

Gospel In Life is a ministry that features sermons, books, articles, and resources from Timothy Keller, Redeemer Presbyterian Church, and Redeemer City to City. The name reflects our conviction that the gospel changes everything in life. In 1989 Dr. Timothy J. Keller, his wife and three young sons moved to New York City to begin Redeemer Presbyterian Church. He has since become a bestselling author, an influential thinker, and an advocate for ministry in cities and to secular people.

About Tim Keller

Timothy Keller is the founding pastor of Redeemer Presbyterian Church in Manhattan, which he started in 1989 with his wife, Kathy, and three young sons.  For 28 years he led a diverse congregation of young professionals that grew to a weekly attendance of over 5,000.

He is also the Chairman & Co-Founder of Redeemer City to City (CTC), which starts new churches in New York and other global cities, and publishes books and resources for ministry in an urban environment. In 2017 Dr. Keller transitioned to CTC full time to teach and mentor church planters and seminary students through a joint venture with Reformed Theological Seminary's (RTS), the City Ministry Program. He also works with CTC's global affiliates to launch church planting movements.

Dr. Keller’s books, including the New York Times bestselling The Reason for God and The Prodigal God, have sold over 2 million copies and been translated into 25 languages.

Christianity Today has said, “Fifty years from now, if evangelical Christians are widely known for their love of cities, their commitment to mercy and justice, and their love of their neighbors, Tim Keller will be remembered as a pioneer of the new urban Christians.”

Dr. Keller was born and raised in Pennsylvania, and educated at Bucknell University, Gordon-Conwell Theological Seminary, and Westminster Theological Seminary. He previously served as the pastor of West Hopewell Presbyterian Church in Hopewell, Virginia, Associate Professor of Practical Theology at Westminster Theological Seminary, and Director of Mercy Ministries for the Presbyterian Church in America.

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