The Radical Sufficiency of Small Faith

The Radical Sufficiency of Small Faith

It’s great to be with you this morning—I so appreciate the invitation to share the Word of the Lord with you on this beautiful Sunday morning. My manner of dress may be a bit unusual from what you are used to seeing behind your pulpit; I come from a Southern Baptist tradition where such attire used to be common; and I’ve adopted it as an ordained theologically trained part-time bivocational pastor and fulltime licensed and clinically trained neuropsychologist. Since I regard both positions as ministry opportunities, serving as a PHYSICIAN OF THE MIND FULLTIME in the secular world and as a physician OF THE SOUL WHEN GRACIOUSLY INVITED into this sacred space in the House of the Lord, I wear this ecclesiastical robe to remind me IN THE PRESENT MOMENT for Whom I speak and represent. Thank you for understanding.

Scripture Reading: Luke 17:5-10

5 The apostles said to the Lord, “Increase our faith!”

6 He replied, “If you have faith as small as a mustard seed, you can say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it will obey you.

7 “Suppose one of you has a servant plowing or looking after the sheep. Will he say to the servant when he comes in from the field, ‘Come along now and sit down to eat’? 8 Won’t he rather say, ‘Prepare my supper, get yourself ready and wait on me while I eat and drink; after that you may eat and drink’? 9 Will he thank the servant because he did what he was told to do? 10 So you also, when you have done everything you were told to do, should say, ‘We are unworthy servants; we have only done our duty.’ ” [1]

[1]The New International Version (Lk 17:5–10). (2011). Zondervan.  Let Us Pray:

Almighty and gracious Father, we thank You for the gift of Your Holy Word, which has been proclaimed in our hearing. Open now our minds and hearts to receive the message You would have us hear through this sermon, that Your Word may take root in our lives and bear fruit here on earth for Your kingdom. We ask this through Christ our Lord, who lives and reigns with You and the Holy Spirit, one God, forever and ever. Amen.

There’s a story that MICHELANGELO BUONARROTI [mee-kel-AHN′-jeh-loh / boon- -a-ROW′-tee] used to tell about the early days of painting the Sistine CHAPEL CEILING in Vatican City. When Pope Julius II first commissioned the work in 1508, Michelangelo protested that he was but a mere sculptor, not a painter, and that such an enormous fresco was impossible for someone of his limited painting experience. The Pope, however, was unmoved by his objections. What Michelangelo discovered, lying there on his back on scaffolding suspended some sixty feet above that chapel floor, was that his perception of impossibility revealed more about his self-imposed limitations than about what he could actually accomplish¹. The masterpiece that emerged from his brush wasn’t the result of Michelangelo suddenly acquiring more artistic ability; it was the fruit of faithfully applying the gifts he already possessed to the impossible task before him.

I wonder if you’ve ever found yourself in Michelangelo’s position—staring at something in your life that feels absolutely, utterly impossible. Maybe it’s a RELATIONSHIP that seems beyond repair, WORDS SPOKEN that can’t be taken back, GRIEF that leaves you feeling dead inside, or HURT that runs so deep you can’t imagine forgiveness ever taking root. Perhaps it’s a DREAM that feels too big, maybe a CALLING that seems beyond your capabilities, or a CHALLENGE that makes you feel much like David facing Goliath with nothing but pebbles in your pocket. In those moments, we often find ourselves echoing the words of Jesus’ disciples when they exclaimed: “Lord, increase our faith!” In times like these, we assume that our problem is insufficient spiritual resources, that we need more faith to tackle the impossibilities before us.

The disciples had been listening to Jesus teach about forgiveness—specifically about forgiving someone who sins against you seven times in a single day. Can you imagine? Seven times! Their response was immediate and visceral: “Increase our faith!” In other words, “Jesus, what you’re asking is impossible. We’re going to need a significant upgrade in our spiritual operating system to pull this off.” Now their request seems reasonable, spiritually mature, right? I mean, after all, isn’t asking God for more faith exactly what good religious people should do when facing overwhelming circumstances?

But here’s where the story takes an unexpected turn, one that challenges everything we think we know about faith and impossibility. Instead of agreeing to give them more faith, Jesus essentially tells them they’re asking the wrong question. He says, “If you had faith like a grain of mustard seed” — not more faith, not greater faith, not industrial-strength faith—but faith like the grain of a mustard seed, you could say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it would obey you.”

Let’s pause here for a moment and consider what Jesus chose for his metaphor. He didn’t mention the more famous “moving mountains” that appears elsewhere in the Gospels. Instead, he specifically referenced a mulberry tree—in Greek, [see-KAH′-mean-nos | sykominos: (συκόμινος)]. Now, if you’ve ever tried to remove a mulberry tree, you know why this detail matters. These trees develop massive, extensive root systems that can spread underground for dozens of feet. And they’re practically impossible to uproot completely. Ancient farmers knew that mulberry trees were notorious for sending up new shoots from any root fragments left behind. In essence, Jesus chose the most stubborn, deeply rooted, persistently-growing obstacle he could think of and said, “Even something as tenacious as this yields to authentic faith.”

The North African bishop Augustine of Hippo, writing in his Confessions in the late fourth century, reflected on his years of spiritual searching before his conversion. He observed that for much of his life, he had been trying to make himself worthy enough, knowledgeable enough, disciplined enough to approach God². But his breakthrough came when he realized he was attempting to build a ladder to heaven when God had already descended from heaven to meet him. Augustine understood that we often confuse our capacity to reach God with God’s capacity to reach us. It’s much like a child trying to reach something on a high shelf by standing on tiptoes instead of asking their parent to lift them up. The solution isn’t taller tiptoes; it’s understanding and utilizing the relationship.

Augustine’s insight about trying to build a ladder to a God who has already descended reveals something profound about human nature—and here’s a fascinating discovery: my clinical field of modern neuroscience has confirmed what Augustine observed spiritually. Researchers have discovered that our brains are wired with what’s called “ATTENTIONAL BIAS” — meaning, we naturally focus on what we perceive as lacking rather than what we already possess³. When we’re convinced we need more faith, our brains literally filter out evidence of the faith we already have. We become like people searching for their glasses while wearing them, unable to see clearly because we’re convinced the tool we need is missing.

I’m reminded of Walter Rauschenbusch [ROW′-shen-boosh], the Baptist minister whose work in THE HELL’S KITCHEN neighborhood of New York City in the 1880s transformed American theology. Rauschenbusch [ROW′-shen-boosh] initially believed he needed more THEOLOGICAL TRAINING, more ECCLESIASTICAL AUTHORITY, more INSTITUTIONAL RESOURCES to address the crushing poverty and injustice surrounding his congregation⁴. But his breakthrough moment came when he recognized that the Kingdom of God wasn’t something requiring vast accumulation of church power—it was already breaking into the world through small acts of faithful solidarity with the oppressed. Rauschenbusch [ROW′-shen-boosh] discovered that social transformation emerges not from amassing religious influence but from faithfully embodying divine justice in whatever circumstances we inhabit. The revolution came NOT FROM ACQUISITION but from surrendering to what was already available—God’s present activity in the world around him.

Rauschenbusch [ROW′-shen-boosh] discovered what Jesus was teaching his disciples in our morning passage—that faith isn’t about accumulation but about orientation, not about QUANTITY but about quality. This is precisely what Jesus is teaching his disciples about faith. The Greek word for faith here is [Pees′-tis | pistis: (πίστις)], which doesn’t primarily mean intellectual belief or emotional confidence. Rather, it refers to active trust—the kind of reliance that actually changes how we live and move in the world. When Jesus talks about mustard seed faith, he’s not referring to a small amount of a large thing; rather, he’s describing a particular quality of trust that, however modest its beginning, it contains within itself the power to transform reality.

Think about what a mustard seed actually does. It doesn’t strain or struggle to become a tree. It doesn’t accumulate more “seed-ness” before it begins to grow. Instead, it simply does what mustard seeds do—it trusts the process of growth that God has embedded within its very nature. The seed doesn’t create the power that transforms it; it simply yields to that power and allows the transformation to unfold naturally.

The American theologian HARRY EMERSON FOSDICK once preached, “The tragedy of life is not that we aim too high and miss, but that we aim too low and hit”⁵. I would add to Fosdick’s insight: often we aim at the wrong target entirely. We AIM AT ACQUIRING MORE FAITH instead of living from the faith we possess. We AIM AT BECOMING BIGGER instead of recognizing how big God already is. We AIM AT EARNINGGOD’S FAVOR instead of trusting God’s character.

This misplaced aim—this confusion about what faith actually requires—is precisely why Jesus doesn’t stop here with the mulberry tree metaphor. But rather, he immediately follows it with a parable that seems, at first glance, completely unrelated. He asks his listeners to imagine having a servant who has been working all day in the fields, plowing and tending sheep. When that servant comes in from his backbreaking day, does the master immediately invite him to sit down and be served dinner? Of course not! The servant first prepares the master’s meal, serves it properly, and only then attends to his own needs.

Now, this parable makes modern readers uncomfortable, and rightly so, because we live in a culture that has, thankfully, moved far beyond the master-servant social structures that Jesus’ audience took for granted. But if we can look past the cultural framework to the spiritual principle Jesus is teaching here, I think we discover something revolutionary about the nature of faith and impossibility.

The Greek word Jesus uses for servant here is [DOO′-los | doulos: (δοῦλος)] which refers to someone whose entire identity and purpose is bound up in serving their master. This isn’t about an economic transaction, nor is it about an employment contract; it’s about a fundamental orientation of life. That is, the servant doesn’t serve in order to earn the master’s gratitude or to put the master in debt. Instead, the servant serves because that’s who the servant is—it’s identity, not transaction.

And here’s where the parable connects to the mustard seed teaching: faith that moves mulberry trees isn’t faith that tries to put God in our debt. It’s faith that recognizes our own fundamental identity as those who belong completely to God. When we stop serving God in order to earn divine favors and start serving because we recognize that we are –  in the beautiful words of the apostle Paul –  ‘not our own’ but have been ‘bought with a price,’ something profound shifts in our relationship with impossibility.

This shift from transactional faith to identity-based faith has empowered some of history’s most unlikely change-makers. ISABELLA BAUMFREE, who renamed herself Sojourner Truth, was born into slavery in New York in 1797 and endured unspeakable hardships before gaining her freedom. When she began her prophetic ministry traveling across America advocating for abolition and women’s rights, she faced audiences who told her she lacked the EDUCATION, the CREDENTIALS, the SOCIAL STANDING to speak on such matters⁶. But Sojourner Truth had discovered something that her detractors had not: her identity wasn’t rooted in what society said she could earn or achieve; it was rooted in whose she was—a beloved child of God. And at the Women’s Rights Convention in Akron, Ohio, when male hecklers said women were too weak and delicate for equality, she famously rolled up her sleeves, showed the scars on her arms from years of brutal labor, and declared, “Ain’t I a woman?” Jesus’ servant parable suggests this same truth: when we know who we are in relationship to God—when our identity is securely grounded in divine love rather than in human achievement—we stop trying to earn our way into God’s favor and only then start living from the security that favor provides.

This understanding of identity-before-action isn’t just ancient wisdom or historical insight—it continues to shape how we approach impossibility today. The late FRED ROGERS, the Presbyterian minister who became America’s most beloved children’s television host, built his entire life’s work on a single theological principle that he learned in seminary. For over thirty years on Mister Rogers’ Neighborhood, Rogers ended nearly every episode by looking directly into the camera and telling children, “I like you just the way you are”⁷. This wasn’t empty sentimentality; it was deliberate theology. You see, Rogers understood that children growing up in American culture would be bombarded with messages that their worth depended on ACHIEVEMENT, APPEARANCE, or PERFORMANCE. Yet he wanted them to know, in their very bones, that they were loved simply for existing—not for what they could do or become, but for who they already were. That grounding in belovedness, Rogers believed, gave children the security to face life’s challenges without needing to prove their worth through constant striving.

The Greek text reveals something beautiful about the servant’s final words in Jesus’ parable—words that illuminate exactly how this identity-based faith actually works. When the servant says, “We are unworthy servants; we have only done our duty,” the word translated “unworthy” here is [ah-KHRI′-os | achreios: (ἀχρεῖος)], which doesn’t mean worthless or without value. Rather, it means “without claim to special merit” — in other words, it refers to someone who has done what was expected without exceeding requirements. It’s the humility of recognizing that faithful service doesn’t put God in our debt; it simply aligns us with our true purpose. The servant ISN’T saying, “I am worth nothing” — that would contradict everything Jesus teaches about our belovedness. Instead, the servant is saying, “I haven’t earned anything extra. I’ve simply been who I am—a servant doing what servants do.” This is the revolutionary insight that connects mustard seed faith to mulberry tree results: when we stop measuring our faith and start living from it, we discover that God’s power operates through surrendered trust rather than accumulated spiritual resources.

The disciples were asking for more faith because they were still thinking transactionally—AFTERALL, more input should produce more output, right? But Jesus redirects them toward relational thinking, MEANING trust placed properly in God’s character and promises accesses divine power that no amount of human spiritual effort could generate. Consider the biblical account of MOSES standing before the Red Sea⁸. The text doesn’t suggest that Moses suddenly received a massive increase in faith. Instead, it shows us a man who had learned to trust God’s character through years of relationship and experience—through the burning bush, through confrontations with Pharaoh, through watching the plagues unfold according to God’s word. When the impossible moment arrived—with the Egyptian army behind him and the sea before him and two million terrified people demanding answers—Moses didn’t ask for more faith. He acted from the trust he had already developed, lifting his staff in obedience to what God had instructed. And God’s power moved through that trust to accomplish what human effort never could have achieved. Moses didn’t create the miracle; he simply showed up faithfully to the impossible moment with whatever trust he could muster.

Or think of the shepherd boy DAVID facing the giant Goliath⁹. When King Saul tried to outfit David with armor and weapons, the young shepherd refused them—not because he suddenly felt a surge of supernatural confidence, but because he recognized that God’s faithfulness in past moments (protecting his sheep from lions and bears) was sufficient foundation for trusting in this present impossibility. David didn’t wait to feel ready; he acted from the relationship he already had with God. He took the tools he knew—five smooth stones and a sling—and stepped into the impossible moment. The giant fell, not because David had accumulated enough courage, but because David trusted the God who had proved faithful in smaller battles.

The French philosopher and mathematician Blaise Pascal [blez pas-KAL], writing in the seventeenth century, spent much of his life trying to build intellectual bridges to belief. But after a mystical encounter with God that he called his “night of fire,” Pascal’s entire perspective shifted¹⁰. He famously wrote that “the heart has its reasons which reason KNOWS nothing of.” What Pascal discovered was that authentic faith isn’t something we construct through intellectual accumulation; it’s something we experience through surrender to divine reality. We don’t build up enough faith to access God’s power; we open ourselves to God’s power through whatever faith we can authentically offer—even if it’s as small as a mustard seed.

This is what Jesus means when he talks about mustard seed faith moving mulberry trees. We don’t create the power that accomplishes impossible things; we simply show up faithfully to the moments we’ve been given, trusting that God’s power can work through our willingness to act despite our limitations. The breakthrough comes not from acquiring more faith but from surrendering what we have to divine possibility.

In our contemporary context, this teaching speaks powerfully to our culture’s obsession with self-improvement and spiritual accumulation. We live in a world that tells us we need more of everything—more EDUCATION, more EXPERIENCE, more CONFIDENCE, more RESOURCES—before we can attempt anything significant. Social media feeds us a constant stream of others’ highlight reels, making us feel inadequately prepared for the challenges we face. The self-help industry generates billions of dollars annually convincing us that we’re not quite ready yet, that we need just one more SEMINAR, one more CREDENTIAL, one more SPIRITUAL DISCIPLINE before we can step into our calling. But Jesus’ teaching cuts through all of that cultural noise and suggests something radically different, which is this: we already possess, in whatever measure of trust we can muster, sufficient connection to divine power to transform the seemingly immovable obstacles in our path.

Here’s something fascinating that brain scientists from my secular discipline have discovered: our bodies hold memories of past experiences that influence our decision-making. When we’ve experienced repeated failures or disappointments, our bodies can develop what researchers call “SOMATIC MARKERS” — meaning, physiological responses that make us feel like IMPOSSIBILITY IS THE DEFAULT SETTING for challenging situations¹¹. Our hearts race, our palms sweat, our stomachs tighten, and these bodily sensations whisper to us, “You can’t do this.” But here’s the beautiful truth: FAITH CREATES NEW MUSCLE MEMORIES—memories of God’s faithfulness that our bodies recognize and that give us courage to act despite appearances. Every time we step out in trust and witness God’s power working through our inadequacy, our bodies learn a new response to impossibility.

This is why Jesus’ teaching about servant identity is so crucial to understanding mustard seed faith. When we know ourselves as beloved children of God rather than spiritual entrepreneurs trying to earn divine favor, we stop approaching impossibilities with the question, “Do I have enough faith to handle this?” and start asking instead, “How can I faithfully respond to what God has placed before me?” The apostle Paul understood this when he wrote about strength being made perfect in weakness. Paul wasn’t celebrating weakness as an end in itself; rather, he was recognizing that weakness properly surrendered to God becomes a conduit for divine power in ways that human strength never could. When you and I stop trying to generate enough spiritual force to move our own obstacles and start trusting that God’s power can work through our faithful response to what’s before us, we position ourselves to witness impossibilities become possibilities.

In closing, the beautiful truth that emerges from this passage considered this morning is that God’s power doesn’t require our spiritual maturity to accomplish impossible things; it requires only our willing participation in divine possibility. When we stop measuring our faith and start living from it, we discover that even mustard seed trust can accomplish what human effort cannot achieve. We learn that the size of our faith matters far less than the size of the God in whom our faith is placed. The mulberry trees in our lives—those stubborn, deeply rooted obstacles that seem immovable—need not define the boundaries of possibility. Instead, they become opportunities to discover that God’s power specializes in working through surrendered trust rather than accumulated adequacy. The path to breakthrough lies not in our accumulating more spiritual resources but in faithfully stewarding the trust we already possess. SO, when you face your impossibilities this week , your mulberry tree moments — and you will— don’t ask for more faith. Instead, show up with whatever trust you have, act faithfully in the moment before you, and watch as small faith meeting big God transforms impossibility into invitation.

Altar Call

This morning, maybe you’re sitting here thinking about your own mulberry tree—that obstacle in your life that feels impossible to move. Perhaps you’ve been waiting to feel like you have enough faith, enough strength, enough worthiness before you come to Jesus. But friend, Jesus isn’t asking you to get your life together first or to build up more spiritual strength before you approach Him. He’s simply asking you to bring whatever small faith you have—even if it’s just a mustard seed of trust—and let Him do the impossible work. If you need to surrender your mulberry tree to the God who specializes in moving immovable things, I invite you to come forward now as we sing, and let’s pray together about what faithful step God may be calling you to take.

Closing Prayer

Gracious God, forgive us for measuring our faith instead of living from it. Help us understand that you require not our spiritual maturity but our willing participation in your divine possibilities. Lord, grant us the humility of the mustard seed and the faithfulness of the servant. And when we face the mulberry trees in our lives, remind us that your power works through surrendered trust rather than accumulated adequacy. Father, we further ask that you teach us to ask not "Do I have enough faith?" but "How can I faithfully respond?" when confronted by seemingly impossible tasks to which you have called us. Help us take mustard seed steps of obedience, trusting that your power transforms impossibilities into grace. We pray in the name of Jesus, who showed us that when small faith meets big God, reality yields to divine love. Amen.

References

¹ Stone, I. (1961). The agony and the ecstasy: A biographical novel of Michelangelo. Doubleday.

² Augustine of Hippo. (397-400/1991). Confessions (H. Chadwick, Trans.). Oxford University Press.

³ MacLeod, C., & Mathews, A. (2012). Cognitive bias modification approaches to anxiety. Annual Review of Clinical Psychology, 8, 189-217. https://doi.org/10.1146/annurev-clinpsy-032511-143052

⁴ Rauschenbusch, W. (1907). Christianity and the social crisis. Macmillan.

⁵ Fosdick, H. E. (1943). On being a real person. Harper & Brothers.

⁶ Washington, M. H. (Ed.). (1993). Narrative of Sojourner Truth. Vintage Books. (Original work published 1850)

⁷ Rogers, F. (2003). The world according to Mister Rogers: Important things to remember. Hyperion.

⁸ Exodus 14:1-31 (New Revised Standard Version).

⁹ 1 Samuel 17:1-58 (New Revised Standard Version).

¹⁰ Pascal, B. (1670/1995). Pensées (A. J. Krailsheimer, Trans.). Penguin Books.

¹¹ Damasio, A. R. (1994). Descartes’ error: Emotion, reason, and the human brain. Putnam.