How to Pray for Help with Your Heart Idols

The Apostle Paul says that we have “exchanged” what we should hallow, or worship, in our hearts with things we shouldn’t. He says, “because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen” (Rom. 1:25).

Notice that Paul doesn’t say that we “quit” or “stopped” worshiping (worshiping is simply another way of describing “hallowing”). He says that we “exchanged.” Your heart is designed by God to hallow the true God. But, because of sin, we “hallow” other things.

I saw the inescapable hallowing function of the human heart most clearly in my kids when they were going through the “Night-Night” stage. The “Night-Night” is what they called a specific blanket that they loved most. It’s the blanket that helped them to transform from terrified to tranquil, from unstable to stable, from loud to quiet and content.

We called it the “secret weapon.” When we dropped the kids off in the Children’s Ministry on Sunday mornings. We told the workers, “if they won’t stop crying, break this blanket out, and they’ll be fine in a minute or so.” The “Night-Night” was undefeated.

And there’s the thing about the “Night-Night.” There was nothing special about the blanket. We didn’t put anything on the blanket, like special oils or fragrances or anything illegal, to get them to like those blankets. All of the kids were given multiple blankets and all of the kids would choose just one of those blankets that would “work.”

It wasn’t about the blanket, it was about their hearts. Their hearts ascribed a certain value on those blankets that wasn’t true about those blankets. It was the kiddy version of what Paul was talking about.

As we get older, we leave our blankets behind, but our hearts are still making the same silly exchange—hallowing the creation over the Creator. We base our inner sense of well-being on people’s opinions, how much money we have in the bank, how “in control” we feel, and the like.

Do you know what your “Night-Night’s” are?

The Bible calls these “Night-Night’s” idols. And everyone struggles with them. Tim Keller, in his book Counterfeit Gods, describes these idols as “anything more important to you than God. Anything that absorbs your heart and imagination more than God.”

What might these be? Not usually bad things. They are typically good things.

Some people’s hearts and, therefore, days, are controlled by the idol of approval. If they are affirmed like they want, then they feel good about life, where it’s headed, and the journey they’re on. If they’re not affirmed, then they feel frustrated, angry, scared, embarrassed, worthless, or some other life-taking emotion.

The Bible affirms the goodness of approval in others eyes in passages like Proverbs 22:1, “A good name is to be chosen rather than great riches, and favor is better than silver or gold.” But sinful hearts have to be careful that this good thing, a “good name,” doesn’t get turned into a God thing that we have to have, that we base our heart’s contentment on. Jesus’ name was slandered by almost everyone, but his satisfaction was taken away by no one. If people’s opinions controlled his purpose, and not his heavenly Father’s opinion, he never would have did what was necessary on the cross to bring salvation to the world.

Do you tend to make an idol out of people’s opinions?

Other people don’t worry about what people think that much. Instead, their hearts and, therefore, their days, are controlled by the idol of productivity. If they are performing like they want to be performing, then they feel good about life, where it’s headed, and the journey they’re on. If they feel unproductive, behind, or anything like this, they feel frustrated, angry, scared, embarrassed, worthless, or some other life-taking emotion.

God is “pro-productivity.” He works, designed humanity to work, created the standards for productivity, and provided tons of instruction on how to work in the Bible. Jesus did the greatest work ever imaginable by purchasing salvation for sinners. But God didn’t create any work, or work process, that he wants you to replace him with. In fact, he commanded us to “rest” from our work so that we’d be reminded that it’s his work that makes the kingdom advance.

Do you tend to make an idol out of working?

But there are other people who don’t care if they are productive or if people have a high view of them, they struggle, instead, with the idol of comfort. If they are resting like they want to be resting, then they feel good about life, where it’s headed, and the journey they’re on. They’re more patient and loving towards people when they are in this place. But if they feel uncomfortable, overbooked, or anything like this, they feel frustrated, angry, scared, embarrassed, worthless, or some other life-taking emotion.

God is “pro-comfort.” He knows that rest is a good thing, which is why he commanded that we “rest” each week. But he wants us to know that our “rest” has limits. He wants us to be productive (Col. 3:23).

Do you tend to make an idol out of rest?

Another major way that people take good things in our lives and replace God with them is with possessions. People that struggle with the idol of stuff, feel good about life, where it’s headed, and the journey they’re on, if they have a certain level of “stuff.” There bank account needs to be at a certain level. Their car, apartment, house, or whatever, needs to look a certain way. If they aren’t at their “level” of stuff, then they feel frustrated, angry, scared, embarrassed, worthless, or some other life-taking emotion.

God loves “stuff.” After all, he created it! But he doesn’t want us to value “stuff” more than we value him.

Do you tend to make an idol out of stuff?

Everybody struggles at the heart level with some or all of these realities.

When you pray for God’s name to be hallowed, his kingdom to come, and his will to be done, you are praying for help in these areas of struggle in our hearts.

Do you ask God to help you overcome your heart idols?

For people who are prone to worship and hallow the god of people’s opinions, ask God to make your heart hallow his name so much that when others’ opinions change, your joy and hope and expectancy doesn’t; or if everyone is happy with you, that you don’t start caring about their opinions more than his.

For people who make an idol out of work, ask God to make your heart hallow his name so much that when you don’t feel productive, your joy and hope and expectancy doesn’t disappear, and your since of well-being isn’t gone; or if you feel super productive or refreshed that you don’t replace him by finding more joy in accomplishment than in him.

For people who make an idol out of comfort, ask God to make your heart hallow his name so much that when you feel overbooked or maxed out, your joy and hope and expectancy doesn’t disappear, and your since of well-being isn’t gone; or if you feel super refreshed that you don’t replace him by finding more joy in your circumstantial comfort than in him.

For people who make an idol out of possessions, ask God to make your heart hallow God’s name so much that when you have less than you want, your joy and hope and expectancy doesn’t disappear; or if you have more than you want, you’re your heart doesn’t replace God with the stuff he is providing you.

When you pray for God’s name to be hallowed, you are praying that our hearts would be free. You’re praying that you would be like Jonathan Edwards was when he was fired and it was said of him, “his happiness was out of reach from his enemies.” In that moment, his heart hallowed the right God.

This post includes content from my book, 21 Days to Childlike Prayer: Changing Your World One Specific Prayer at a Time.

The Vague Prayer Syndrome: What It Is and What To Do About It

The older I get, the harder it is for me to come up with a Christmas list, birthday list, and a Father’s Day list. I’m not sure why it’s so hard. Maybe it’s because I buy what I want? Could be that I know that it hurts the budget? Maybe it’s because I don’t want to make sure I ask for the best possible thing and I don’t feel like I have time to really think it through? I’m not sure. But it’s a challenge for me. And from talking with others, it’s a challenge for them.

You know who this isn’t a challenge for? Kids. When it is time for them to come up with a “gift list,” they have no problem at all. They know exactly what they want. They have no regard for the budget. None! They don’t think about whether or not it is “wise” for them to use their limited number of “presents” on that circled option in the magazine they keep showing you. Children know how to ask for stuff and they know how to ask with specificity.

Part of embracing a childlike identity involves embracing specificity. It means that we learn to get specific with prayer requests. And as easy as that sounds, I’ve found in my life and the lives of those I’ve helped learn to pray, that it is difficult. It takes a good deal of work to help people pray with specificity.

Why? Because most people suffer from what I call, the “Vague Prayer Syndrome.” The “Vague Prayer Syndrome” is where you only pray vague prayers. Those vague prayers are so vague that you would never really know if they were answered by God in any meaningful way. These prayers are general prayers that don’t create any expectancy for an answer or any excitement when they are answered.

As someone who still battles the “Vague Prayer Syndrome,” I know what it sounds like—“God be with us today…” Or, “Bless this food…” The great news is that God answered those requests with a “yes!” How do I know? Because he promised us in Scripture that he would “be with us” and “bless us.”

Do you ever pray prayers like this? Do you only pray like this?

It’s perfectly fine, of course, to pray these prayers. But when you learn to get specific with your prayer requests, God becomes real in your heart and life in a way that he never would without that specificity. And when he becomes real in your life, when you get a glimpse of him working specifically in your life, it changes you. Fearful people experience peace. Bored people find purpose. Frustrated people find patience. Empty people get filled. People reach goals that are beyond their abilities to bring about.

I’ve seen it over and over in my life and in the lives of the people around me. That’s why we say, “Specificity leads to visibility.” When we get specific, the invisible God becomes visible in our lives in a way that he wouldn’t without that specific request. How do you see the invisible God? Get specific with your requests.

Instead of just saying, “Make today go great,” say, “Cause someone to encourage me by the end of the day.” Or, in regards to that staffing effort at work, say, “provide a new employee this week that we know is the one.” Here are some other examples:

God, will you send someone to encourage me today?

God, will you make my encounter with ___________ encouraging tonight?

God, will you cause my parents speak to me more kindly in the mornings this week?

God, will you make my boss affirm my work on this project this week?

God, will you make this physical ailment go away by Thursday?

When God answers those requests, you see God working in your life in ways that lift your heart out of the mess of the world. You start to really believe you have a Father in heaven that cares about you and your problems and plans. You start to awaken the childlike faith your heart was made for.

This is exactly what you see throughout the Bible. When you read the Psalms, you see them specifically praying that God would deliver them from specific fears, help them overcome a specific enemy, revive their soul, and more. The Israelites prayed for a specific deliverance from Egyptian oppression when they were slaves in Egypt. They prayed specifically for God to save them when they had their backs up against the Red Sea and an Egyptian military coming after them. Daniel specifically asked for deliverance from the Lion’s Den. Jonah prayed specifically for God to get him out of that fish’s stomach. Nehemiah prayed that God would help him build a specific wall. And the list could certainly go on. In all of these situations, they knew if God answered those prayers. And because they were specific with their prayers, when the invisible God answered their prayers, they “saw” him in a way that they wouldn’t have without that specificity. Their specificity led to visibility.

The same is true for us. When you are bold enough to pray specific prayers, you give God an opportunity to become visible—real—in your life, in a way he wouldn’t without that specificity.

Ask God to work in specific ways, by specific times, and watch him work. Will he always give you a yes? Of course, not. But many times he will. And when he does, you’ll find that your sense of his presence in your life is greater than any prayer request he grants.

This post includes content from my forthcoming book, 21 Days to Childlike Prayer: Changing Your World One Specific Prayer at a Time (pub. Jan. 18, 2022).

Towards Healthier Disagreements: 4 Practices to Avoid

When the biblical idea of “unity and diversity” becomes a reality amongst Christians, most figure out that it is a lot messier than it sounds. There’s enough sin present amongst believers to make unity impossible, apart from a massive influx of heart-transforming grace. 

One of the temptations in the midst of the friction is either to be, as Ken Sande so helpfully pointed out, a “peacefaker” or a “peacebreaker.” Peacefakers ignore problems that should be dealt with. Peacebreakers create problems. Jesus, of course, calls us to be “peacemakers.” Peacemakers face and fix problems with the grace of God for the glory of God. 

As we all attempt to be the peacemakers that Jesus intends for us to be, I thought it might be helpful to offer a few practices that we should avoid. 

Demonizing – It’s okay, in a world where we “see through a glass dimly,” to disagree. We should expect it. One of the temptations we need to avoid is the temptation to demonize those we disagree with. Demonizing is not just questioning their perspective; it’s questioning their motives. They have bad motives instead of the pure motives we have. C’mon. Love your neighbor as you love yourself. You love receiving the benefit of the doubt, and so do others. 

Narrativizing – Narrativizing is putting people in a “narrative” or “group” because they said something that has been said by that “narrative” or “group.” Just because someone says something that has been said by a movement you don’t like doesn’t mean that they are a part of that movement. If you don’t want to be put in a movement you dislike, then do your best to avoid doing that to others. It’s intellectually lazy and dishonest.

Propagandizing – Propagandizing often happens when we exaggerate to advance a particular perspective. Exaggerating is a form of lying. Don’t exaggerate others’ perceived misdeeds or your own perceived successes. Nobody likes to have serious conversations with people who misuse the truth in this way. This is especially tempting when the person does not share your perspective.

Catastrophizing – We live in a world that acts like every little problem is the end of the world. Peter messed up more than once. The mission can still move forward even when leaders mess up doctrine or practice. It doesn’t mean it isn’t important; it means that it isn’t ultimate. Respond appropriately.

The answer for biblical unity isn’t less disagreement; it’s healthier disagreement. If we are going to be peacemakers, we need to avoid these four problematic practices. 

Answers to Specific Prayer: When God Provided Cigarettes in a Soviet Jail

As I was reading Rod Dreher’s, Live Not By Lies: A Manual for Christian Dissidents, I came across a story about a specific answer to prayer that I had to pass along to you. It’s the story about how Alexander Ogorodnikov, who was unjustly thrown into prison by an oppressive Soviet government, saw God work in an unusual way. He was one of the most famous dissidents of the late Soviet period (195). Although he was a rising start amongst the communists, even catching the attention of the KGB, he converted to Christianity in his 20’s and ended up in prison.

Dreher quotes Ogorodnikov, telling one of his stories from prison:

When they put me in the cell with the other inmates, I said, ‘Peace be with you!’ One of the prisoners asked if I was a Christian. I said yes. He told me to prove it. Another inmate said, ‘We are the scum of the earth. We don’t even have cigarettes. If your God will give us cigarettes, we’ll all believe in him.

Dreher continues,

Ogorodnikov told his fellow prisoners that the body is the temple of the Holy Spirit, and smoking fouls it. But, he continued, God loves you so much that I believe he would even give you cigarettes as a sign of his mercy. Ogorodnikov asked them all to stand and pray together for this. Everybody laughed, but they stood respectfully as he led them in prayer.

Ogorodnikov continues,

That cell was very crowded, but it became very quiet. We prayed for fifteen minutes, then I told them the prayer was over and they could sit down. At just that moment, the guards opened the cell door and threw a bunch of cigarettes into the cell.

It was incredible. There was the sign I had prayed for. The prisoners shouted, ‘God exists! He exists! And that is when I knew that God was speaking to me too. He was telling me that he had a mission for me here in this prison.

As I read this story I couldn’t help but think about what the psalmist said in Psalm 115:3, “Our God is in the heavens and does whatever he pleases.” God is often more eager to answer our prayers than we are to offer them. I pray this story encourages you to pray for the specific things on your heart today, whatever situation you find yourself in.

Answers to Specific Prayers: God Solves A Difficult Staffing Issue

Specificity leads to visibility. When we get specific with our prayers we give the invisible God an opportunity to become visible to us in a way he wouldn’t without our specific prayers. And when God becomes visible to the eyes of our hearts and minds, hope, peace, and so many other life giving realities increase.

One of the ways God often helps his children pray with greater confidence and specificity is by hearing about how other people prayed specifically and saw God work. To this end, I’d like to tell you about how God answered an employers work, prayer request about 5 or 6 years ago.

The employer found himself in a situation that many employers find themselves, with an employee that wasn’t a good fit. He was wrestling with how best to handle that situation. With the company being a small business, relationships were deeper. Deep relationships brought great joys, but the challenges were great too. He knew, for the sake of the business, he had to remove this person from their role. But how could the employer have this difficult professional conversation without ruining the personal friendship?

While there are certainly different approaches that someone can use in this kind of situation, this particular employer started praying that the employee would find another job on her own that she was excited about, and that it would happen within 30 days. He wrote the prayer down and prayed it daily, during his normal devotion time. About a week and a half later, the employee came to him and told him about a new opportunity that she would be taking!

The employer was so grateful that God answered his specific prayer in a way that helped him both professionally and personally. But even more importantly, when you hear him talk about what happened, you understand that the experience of God’s love and control was even greater than the specific answer. The day that his prayer was answered was a day he sensed the powerful, “I’m-working-at-your-work-too” presence of God. And as he walked in this awareness of God’s presence and power, it ignited more hope in his heart. God’s greatness was more recognized in his heart which caused the size of his other problems to decrease there too. He walked home in hope that day. That hope drove him to ask specifically for God to do more with other problems and plans on his heart.

I know what some of you are thinking. Maybe that employee would have moved on anyways? Perhaps. It’s possible God would have done that without the employer’s specific prayer. But that’s not what happened. The employer prayed specifically. And because he prayed specifically, he, in a very real sense, saw the invisible God at work. Specificity leads to visibility. Of course, God doesn’t always answer our prayers with a “yes,” but he always does what’s best. That’s why we offer our specific requests with childlike trust.

What specific problems and plans are on your heart and mind today that you can turn into specific prayers?

Life After Your Short Term Mission Trip

igor-ovsyannykov-191182I love “mission trip meals.” Not so much for the actual food, as much fun as that can be, but to watch the way team members respond to the “exotic” meals placed before them. These meals aren’t the kind that you’ll find at Whole Foods or any other American restaurant. They are, shall we say, “unique.” Thankfully, most people find a way to show their appreciation for the great generosity being shown to them. While it’s rare for anyone to eat everything, most of us end up eating something.

As you make your way back into “normal life,” I’d like to offer you some food for thought. I’d like to serve up a few pieces of advice that might help you transition back into American life in a way that energizes you and positions you to take greater steps forward for the kingdom. Like your “mission trip meals,” I doubt anyone will take everything I offer here. But, perhaps, you’ll find one or two pieces of advice nourishing to you as you go. Here are 12 insights I think are worth remembering when reentering the States.

Remember What It’s Like To See Past “Normal Life” – When you spend time amongst people from different cultures, you realize pretty quickly that your definition of “normal” really isn’t “normal.” You don’t have to be on the go all the time, pursue more and more, care what’s happening on the internet, or be involved in ___________, to have a life of joy, hope, love, peace, and meaning.

Remember What It’s Like To Be Thankful – Most of your days on the mission field are filled with gratitude. You’re thankful for big things and small things. Often times, you’re gratitude naturally overflows into conversations where you share your thankfulness with others. Gratitude is supposed to be one of the key marks of every Christian’s life, although it’s often missing in our normal lives. If you discover it anew on the mission field, don’t let it go when you come back.

Remember What It’s Like Not To Be “Too Busy” – The slower pace of the mission field often helps us realize the hyper speed we’re accustomed too. It’s amazing how much more of life you actually see when you slow down a bit. You won’t be able to keep “mission field pace” when you return to “normal life,” but perhaps you are better equipped to slow down in life giving ways.

Remember What It’s Like To Disconnect From The Internet – Limited internet access on the mission field is steadily becoming one of its most transformative elements. After a few days of detox, people often realize they enjoy life more when they have limited internet access. When you go back to normal life, try to maintain “limited internet access” so that your life can be more of what you hope it will be.

Remember What It’s Like To Be Present – Mission trips are typically filled with people talking with others more often and more deeply than they would otherwise. The amount of time you spend with a mission team requires you to move past the surface. Some of this level of fellowship is caused by the lack of Internet access. Indeed, when we lack internet connection, we often find personal connection. There’s, of course, more to this dynamic. At the very least, remember to be like Jesus who prioritized consistent, unhurried conversations.

Remember What It’s Like To Engage With God Daily Through Bible Reading And Prayer – Most people find themselves praying and reading the Bible more on mission trips than they did before. These habits are necessary for any relationship to grow, especially one with someone you don’t “see” everyday. Remember how meaningful these moments were to you on the mission field as you get back to “normal life.”

In Part 2, I’ll offer the remaining pieces of advice. In the meantime, would you pray with me for a team that is transitioning back into “normal life”?

Father, Cause Your Holiness To Shine

qjsyqqqzkmg-jesse-gardner

I remember exactly where I was when it happened. I was standing just outside the front door of one of my favorite Mexican restaurants. When it happened, I stopped my conversation, turned to it, and took it in. The “it” that happened was the rare appearance of the sun in January in Mid-TN.

You see, here in Mid-TN we have winters filled with gray, cloudy, energy depleting skies. We don’t get much snow or ice. Just gray skies.

Everything just seems worse in this kind of situation. Sure, we still get around and do all that needs to be done. But it just isn’t as fun, easy, or energizing as it is in the Spring or Summer when the sun is shining about everyday.

The sun, of course, still shines in the winter. It doesn’t take winters off. It’s just not visible, except for those rare moments when it’s energizing, life-giving beams break through the clouds like it did for me that day.

That’s what this prayer is all about. It’s about praying that the glory of God’s awesome, life-giving, energizing holiness would shine through the “gray skies” that have covered our hearts since sin entered the world. We aren’t praying that God would become awesome and able to shine. No, he always has been, is, and will be awesome. We’re praying that we could see and experience more of the awesome holiness that is always true of him. We’re praying that his glorious “beams” would break through all of the “grayness”of  our sin that has covered our hearts, lives, and world. We’re praying for more of the one Being we actually need. We want to see more of him. We want increased capacities to love him, enjoy him, and serve him.

Father, cause your holiness to shine…

3 Ways To Ignite Your Prayer Life

ygjyfwmec68-david-beale

Why do atheists pray? Sure, not all atheists pray. But 34% of atheists said they’ve prayed. 34%! Isn’t that amazing?! I think it is. But I don’t think it’s that surprising. After all, there is something unusually beautiful about the idea that you could see miracles take place simply because you asked. There’s something incredibly attractive about the notion that your problems and plans could be handled by an all-knowing, all-powerful, all-loving, and all-present God!

Yet, for many Christians, prayer is almost non-existent. For most Christians, prayer plays practically no role in their lives. Why is this the case? Some Christians probably haven’t been taught how to pray. Others, perhaps, have never tried to learn anything about prayer. Most, probably, are just too busy to pray. Whatever the reasons are for the lack of prayerfulness amongst us, I think we’d all agree they don’t justify our silence. I think we’d all agree, perhaps, that it makes no sense for the church to fail to ask our infinite God with his infinite resources to help us with our overwhelming problems and ambitious aspirations.

That’s why we’ve spent the last month reflecting on “5 Life-Changing Prayers” and will spend the next few weeks on a #30DaysOfPrayer journey! But in order to get started on this journey rightly, I think there are at least three truths that we need to take to heart.

First, prayer happens when we realize that God’s a Father who can help with anything and we’re childlike enough to need that help in everything. Prayer starts when we have a low enough view of ourselves that we realize that we need help and have a high enough view of God that we think he can help us. Ultimately, prayer is about identity. It’s about how we view ourselves and God. If you don’t think God can help you, you won’t ask him for help. If you don’t think you need help, you won’t ask for help. Often times then, our doctrine of God—our understanding of God—is our prayer problem. Other times, our doctrine of humanity—our understanding of ourselves—is our prayer problem. Recover a biblical view of God and humanity by realizing that we need God’s help enough to ask and he’s competent enough to make a difference. We need to realize that God’s a Father who can help with anything and we’re childlike enough to need it in everything.

Second, prayer happens when we use our desperation as a starting point for our prayers. When you face problems, ask God to solve them. As you feel pressures, ask God to relieve them. God intends for your problems to ignite your prayer life. Paul Miller rightfully and insightfully said, “prayer isn’t for the disciplined, it’s for the desperate.” That’s exactly what we see in Scripture as the Israelites “cry out” to God by the Red Sea, at Jericho, in the face of giants, and more. That’s what we read as the church “cries out” for Peter before he is executed. It’s what we’re told the Spirit enables us to do as we “cry, Abba, Father.” When you cry out, you are desperate. Let your desperation ignite your prayer life.

Third, prayer happens when we use our aspirations as a starting point for our prayers. When you dream about your life, ask God to cause those dreams to come true. When you make plans and set goals for your life, ask God to do the heavy lifting. Our aspirations are designed to ignite our prayer life. In Acts 1, the people of God pleaded with God to advance his kingdom purposes in the world. They asked God to move in their midst. And in Acts 2, God moved in ways they had never seen, could never bring about, and never could have imagined. Without the prayer in Acts 1 there would be no Pentecost in Acts 2. When you think about your plans, ask God to bring them to life. Ask him to enable you to have an impact that goes above and beyond your competencies.

Everybody can grow in their prayer life. We’re praying that kids, students, and adults ask more of God and see Him work in miraculous ways. Let’s prepare our hearts for this Saturday’s launch of #30DaysOfPrayer!

C.S. Lewis on Community

“In each of my friends there is something that only some other friend can fully bring out. By myself I am not large enough to call the whole man into activity; I want other lights than my own to show all his facets. Now that Charles is dead, I shall never again see Ronald’s [Tolkien’s] reaction to a specifically Charles joke. Far from having more of Ronald, having him “to myself” now that Charles is away, I have less of Ronald…In this, Friendship exhibits a glorious “nearness by resemblance” to heaven itself where the very multitude of the blessed (which no man can number) increases the fruition which each of us has of God. For every soul, seeing Him in her own way, doubtless communicates that unique vision to all the rest. That, says an old author, is why the Seraphim in Isaiah’s vision are crying “Holy, Holy, Holy” to one another (Isaiah 6:3). The more we thus share the Heavenly Bread between us, the more we shall have.” – C.S. Lewis