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How To Be Strong

October 7, 2024
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We’re in the second of a two-part series on the devil and the conflict between supernatural forces of good and supernatural forces of evil. 

In Part 1, I made my case for why I think it’s immanently sensible to say there really is a devil. And we talked about Satan’s weapons and strategies. If you go through the Bible all the way back to Adam and Eve, what is Satan’s strategy? He’s not possessing them. He’s lying to them. On the basis of that understanding, we’re going to proceed and look at the Christian’s weapons and strategies.

If you want to defeat the forces of evil and be successful in the battles of life, you must put on the full armor of God. What is that? In this passage, we can learn 1) when to put it on, 2) what it is, 3) how to put it on, and 4) whom to remember when you do.

This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on February 5, 2012. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 6:14-24.

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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Past Episodes

The devil. Spiritual warfare. In Africa, Latin America, Asia, most places in the world, the idea of spiritual warfare—of a conflict between spiritual good and spiritual evil—is not an unusual concept. Many people in many parts of the world think this helps make sense of reality. But here in the Western world, we find it a foreign concept.  Let’s look at this passage on spiritual warfare, and let’s notice 1) whom we fight, 2) what we fight, and 3) how we fight. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on January 29, 2012. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 6:10-13. 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.
October 4, 2024
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What it means to be a Christian is to be theologically driven—it means stuff about the cross, and grace, and redemption. And all those things have an effect on how we live in every area of our practical lives.  It’s helpful to look at the big picture and to see how Christ really is Lord of every area of life. In Ephesians 6, two of those areas are laid out for us: work and family.  Let’s take a look at this under these three headings: 1) Jesus and your work, 2) Jesus and your family, and 3) Jesus and your life. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on January 22, 2012. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 6:1-9. 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.
October 2, 2024
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Ephesians 5 is like a fair number of people in New York City. It’s both rich and famous. Because it’s so rich, you could work through it word by word and get quite a bit out of it. But it’s also advantageous to do what we’re going to do, which is to fly over the whole thing. In this way, we’ll get a panoramic view of the immense biblical wisdom on this subject of marriage. What we learn about marriage here is 1) what it is, 2) what it does, 3) what it needs, and 4) what it shows. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on January 15, 2012. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 5:21–33. 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.
September 30, 2024
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Christianity is not just a vitamin supplement. It doesn’t just come into your life and give you a little boost to live a better form of the life you’re living. It’s a sweeping revolution that affects every part of you. In Ephesians 5, we have a long passage on what it means to live the Christian life. And it’s not that we live in a certain way and, therefore, become Christians. It’s that we become Christians and, therefore, live in a certain way—because we’re saved not by what we do but by what Christ has done. In this passage, there are three important keys to understanding what it means to live the Christian life. It entails 1) knowing sin and walking in obedience, 2) knowing the time and walking in wisdom, and 3) knowing the Lord and walking in joy. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on January 8, 2012. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 5:5–21. 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.
September 27, 2024
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We all want to change. I don’t know anybody who doesn’t say, “I really need to change.” And one of the greatest things about Christianity is Christianity gives you the resources to change. Jesus Christ was born into this world to give us second birth. The idea of being born again means radical change. Often we don’t quite know how change actually happens. But Ephesians 4 gives four concrete principles for how the gospel helps us change. What does change mean to Christians? It means you have to 1) make a decision, and 2) change from the inside. And you do that by 3) transforming your thinking, and 4) being captivated by him. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on December 12, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 4:17–24. 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.
September 25, 2024
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In Ephesians 4, we find a pretty remarkable argument. The argument has three parts. The flow of the argument is that even though we have the life of the trinity in us, we live in spiritual immaturity until we’re willing to do the hard work of developing and creating unity in the church. Let’s take a look at each part: 1) the life of the trinity, 2) we live in spiritual immaturity, and 3) do the hard work of developing and creating unity in the church. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on December 4, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 4:1–16. 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.
September 23, 2024
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Thinking about the gospel of Jesus Christ leads Paul to pray in a particular way—in a passionate way. Usually people in those days prayed standing. Paul kneels—it’s a sign of great emotion and solemnity. And what does he so passionately pray for? That his readers—and that also means us—would be strengthened with the power of the Spirit. Let’s explore this: 1) Why is that so important? 2) What is it? and 3) How do we get it? This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 27, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 3:14–21. 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.
September 20, 2024
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Most teachers tend to overlook or go past this particular passage in Ephesians 3. Here’s the reason. In the middle of the first sentence, there’s a dash. Paul just breaks off and goes into a digression, literally a sidebar, and he doesn’t come out of it until verse 13. This really is a sudden thought he had. And yet, what’s in here is so practical. In here we’re going to learn 1) the hardness of life, 2) the wonder of grace, 3) the brilliance of the church, and 4) the freedom that comes. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 20, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 3:1–13. 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.
September 18, 2024
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There’s a problem. We aren’t what we are. The book of Ephesians is ultimately about the church. Paul very directly talks about what the church is and who the church is. These are some of the most powerful passages on that subject that you’re ever going to find. And in Ephesians 2, we’re being told 1) what we were, 2) what we are, and 3) how we can really become what we are. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 13, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 2:19–22. 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.
September 16, 2024
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Paul prays that we’d see the evidence of God’s mighty power at work in the world. And in Ephesians 2, we see one of the main ways we can be sure God’s power is at work. It’s the real heart of what Ephesians says about the church. And that is that inside the church, people who could never get along outside the church, are now living together in peace. Paul says God has addressed one of the main problems the human race has ever had: 1) what is the problem? 2) what is God’s solution for it? and 3) how did he bring it about? This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 6, 2011. Series: A Study of Ephesians: Who is the Church? Scripture: Ephesians 2:11–18. 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.
September 13, 2024
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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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