Weak Faith, Mighty Savior

June 21, 2026|Weak Faith, Mighty Savior|Mark 9:14-29

Will Davis

This morning we step away from Acts and into the Gospel of Mark. Mark, or John Mark, is a familiar figure from Acts. A man who knew both failure and restoration, and who was closely associated with the Apostle Peter. That is significant because Peter himself knew what it meant to have weak faith and yet experience the restoring grace of Christ. Early church fathers connect the Gospel of Mark to Peter, with Justin Martyr in the year 150 referring to Mark as “the memoirs of Peter”, and Irenaeus calling him “the disciple and interpreter of Peter”.

So, with the back drop of Mark in place, if you haven’t already turn with me to the Gospel of Mark as we look 9:14-29

14 And when they came to the disciples, they saw a great crowd around them, and scribes arguing with them. 15 And immediately all the crowd, when they saw him, were greatly amazed and ran up to him and greeted him. 16 And he asked them, “What are you arguing about with them?” 17 And someone from the crowd answered him, “Teacher, I brought my son to you, for he has a spirit that makes him mute. 18 And whenever it seizes him, it throws him down, and he foams and grinds his teeth and becomes rigid. So I asked your disciples to cast it out, and they were not able.” 19 And he answered them, “O faithless generation, how long am I to be with you? How long am I to bear with you? Bring him to me.” 20 And they brought the boy to him. And when the spirit saw him, immediately it convulsed the boy, and he fell on the ground and rolled about, foaming at the mouth. 21 And Jesus asked his father, “How long has this been happening to him?” And he said, “From childhood. 22 And it has often cast him into fire and into water, to destroy him. But if you can do anything, have compassion on us and help us.” 23 And Jesus said to him, “ ‘If you can’! All things are possible for one who believes.” 24 Immediately the father of the child cried out and said, “I believe; help my unbelief!” 25 And when Jesus saw that a crowd came running together, he rebuked the unclean spirit, saying to it, “You mute and deaf spirit, I command you, come out of him and never enter him again.” 26 And after crying out and convulsing him terribly, it came out, and the boy was like a corpse, so that most of them said, “He is dead.” 27 But Jesus took him by the hand and lifted him up, and he arose. 28 And when he had entered the house, his disciples asked him privately, “Why could we not cast it out?” 29 And he said to them, “This kind cannot be driven out by anything but prayer.” 

Now, there are moments in life when everything seems to be exactly as it should be.

The family is healthy. The bills are paid. The children are doing well. Work is encouraging. Prayer feels natural. Worship is joyful.

We experience what Peter experienced on the mountain and we are tempted to say, "Lord, it is good that we are here."

But life rarely stays on the mountain, right?

Life always seems to find its way back into the valley doesn’t it.

These valleys always look different, but are difficult and trying all the same weather; it's the valley of sickness, the valley of broken relationships, the valley of prodigal children, the valley of doubt, the valley where our strength runs out and our faith feels weak.

That is exactly where Mark brings us this morning.

If you read just a few verses back you will see Peter getting to witness the transfiguration of Jesus. Peter, James, and John bore full and complete witness to the glory of Jesus unveiled before them. Moses and Elijah stood with Jesus, as they heard the Father declare from heaven, "This is my beloved Son; listen to him."

Everything on the mountain points to the majesty of Christ. Imagine getting to witness the full glory of our savior. The 3 men must have been on the highest of mountain top experiences, but as soon as they come down from the mountain they walk into a completely different scene.

Instead of worship, there is arguing. Instead of glory, there is suffering. Instead of confidence, there is unbelief. Instead of the only begotten Son of God shining in divine majesty, there is a broken son being destroyed by demonic oppression.

Why this sudden change from mountain top high to valley low?

I believe Mark really wants us to see something here.

The same Christ who is glorious on the mountain is still sufficient in the valley.

And believer that is good news for us here this morning, because most of life is lived and experienced in the valley.

This Father's Day there are fathers sitting in this room carrying burdens that no one else sees. Some are carrying guilt over failures from years ago. Some are praying for children who have wandered from the Lord. Some are exhausted from trying to hold their families together. Some wonder if they have done enough or if they have failed the people they love the most.

Sadly many will hear messages this morning telling men they just need to work harder, lead better, pray more, or to simply be stronger. While those things do matter, many fathers, and if we are honest all of us, leave feeling defeated because we know how often we fail. We know how often we fall short of the mark.

But, Church please understand that this passage here in the Gospel of Mark is not ultimately about fathers.

It is about a Savior who steps into brokenness and proves Himself abundantly sufficient for weak and weary people. This morning we will see disciples who are weak, a father who is weak, a crowd that is bent toward disbelief, and a boy who is helpless.

Yet what we will see is that through it all Christ is more than enough. My prayer is that this morning we will be reminded that no matter what valley life puts its in, Christ is more than enough.

Mark 9 introduces us to a father who has nothing left. He is exhausted, desperate, and powerless. He does not come to Jesus with confidence in himself but with a confession of weakness. And that confession becomes the heartbeat of this entire passage: 'I believe; help my unbelief.'

Before we look at the father's confession of faith, Mark first wants us to see something else.

He wants us to see a scene filled with failure.

Because until we recognize the insufficiency of man, we will never fully appreciate the sufficiency of Christ.

Every person in this account is confronted with the same reality. The scribes cannot help. The crowd cannot help. The disciples cannot help. The father cannot help. The boy certainly cannot help himself.

The valley exposes what the mountain had already declared: there is only One who is sufficient.

So let's begin where Mark begins and consider our first point:

I. The Failure of Man Exposes the Sufficiency of Christ.

We see in verse 14 that Jesus, Peter, James and John are meeting back up with the other 9 disciples only to find that that large crowd has grown around the group. And in the midst of the large crowd there is a group of scribes that are arguing with the 9 about something. 

This fact should not surprise us. Throughout the Gospel of Mark the scribes are constantly questioning, challenging, and attempting to undermine Jesus and His followers. Folly rarely announces itself openly. More often it disguises itself as sincere questions and reasonable discussion.

The scribes were not there seeking truth. They were there for one simple reason. They were attempting to create doubt in any who might seek to follow Jesus. They were hoping to weaken the crowd's confidence in Christ. And they had stumbled upon the perfect opportunity.

The 9 disciples had failed. A desperate father brought his son to them, and they could do nothing. Can you imagine the scene? The scribes are smiling and launching insults and accusations against Jesus and His disciples.

The crowd is probably confused and divided. Whispers of doubt are building and getting louder and louder, leaving the disciples embarrassed and probably frustrated.

But more importantly a father is disappointed and broken-hearted that his son is still suffering. At this moment everything seems to be falling apart around the disciples and the father.

The sad reality is that this scene Mark lays out for us here is remarkably familiar because we still live in a culture that constantly pressures us to doubt the claims of Christ. 

The scribes were creating doubt, and our culture does the same. We are constantly told that faith belongs in private while science alone explains reality. If we are not careful, the world's unbelief begins to shape our own expectations, and we stop expecting God to work. 

Look at the disciples who had spent years walking beside Jesus. They had seen demons cast out. They had witnessed the impossible become reality. They had even been given authority to cast out demons themselves and been successful in doing it.

Yet the moment Jesus is absent from their sight, they fail. Why? Somewhere between receiving Christ's authority and exercising it, they shifted their confidence from Christ to themselves. Yesterday's victories became today's self-reliance. They forgot that the power was never theirs to begin with. Every miracle, every victory, every success had always been Christ working through them.  

That same temptation is still very real for us today. It is possible to have years of church attendance, years of Bible knowledge, years of ministry experience, and yet still place our trust in ourselves instead of Christ. 

Look how Jesus responds after the father tells Him what is going on. This is not a response to merely the father. It is a response to the scribes, to His disciples, and to all that had seen Him perform miracle after miracle.

This is not a response of anger or frustration, it is a response of sorrow.

"O faithless generation, how long am I to be with you? How long am I to bear with you?"

These are not the words of an impatient Savior but of a grieving Savior.

The One who has faithfully revealed the Father, cast out demons, healed the sick, cleansed lepers, calmed storms, and even raised the dead is still met with unbelief. His lament is not the irritation of a teacher whose students are slow learners; it is the sorrow of the Messiah standing before a people who continually refuse to trust Him 

The disciples had enough experience to make them confident, but not enough dependence to make them prayerful.

They knew about Christ's power but in this moment they were no longer relying upon Christ Himself. The scribes knew all the writings from the Law and the Prophets and yet they still refused to believe Him.

Don’t miss this, the scribes knew the Law and the Prophets but missed the One to whom they pointed. The crowd loved the miracles but refused to submit to the Messiah who performed them. The disciples possessed authority but forgot their dependence. Every group in this passage reveals the same problem, it’s not a lack of information, but a lack of faith. 

And if we are honest with ourselves we quite often fall into this same way of thinking. We trust our experience. We trust our plans. We trust our abilities. We trust our parenting methods. We trust our wisdom. We trust our routines. Only to discover over and over again that none of those things can accomplish what only Christ can accomplish.

No father can change the heart of his child. No mother can save her family. No preacher can convert a sinner. No church program can produce spiritual life. These statements should not discourage us; they should liberate us. Because God never called fathers or mothers to be saviors. He already sent one. Our calling is not to produce spiritual life but to faithfully point our families to the One who alone gives life. 

Only Christ has that authority. Here is a hard pill for us to swallow, one of the greatest gifts God gives us is allowing us to fail just enough to remind us that we were never sufficient in the first place. This is why Peter refers to the refining process as something more precious than Gold to the believer. 

Every failure strips away our self-confidence and should drive us deeper in total dependence on Christ. This is what Jesus has been trying to teach His disciples, and what He is teaching them here. He wants them to understand that soon He will be gone. Soon they will no longer walk by sight. They will have to walk by faith. And so will we.

Everyday of our walk as believers is lived by trusting the Christ we cannot see through the Word He has graciously given.

We must understand that Christ's power has not diminished because He is no longer physically present. His authority has not weakened. His sovereignty has not changed. His compassion has not faded.

Think about this for a moment, the valley has a way of exposing what the mountain often hides. It exposes our weakness, our inability, our self-reliance, and our need for grace. But it also reveals something infinitely greater. It reveals that Christ is every bit as glorious in the valley as He is on the mountain.

The disciples failed. The scribes doubted. The crowd questioned. The father was exhausted. The boy was helpless. Yet Christ remained completely sufficient.

And that same Christ stands before us today.

Not asking whether we are strong enough, wise enough, or capable enough, but calling us to trust Him. Because hope has never rested in the strength of His people. Hope has always rested in the sufficiency of their Savior.

And that is where hope begins, not with confidence in ourselves, but with confidence in Him. But what does that confidence actually look like? Does Jesus require perfect faith? Does He only receive those who never struggle, never doubt, and never grow weary? Mark answers those questions by shifting our attention away from the disciples and toward a broken father whose faith is weak, wounded, and yet profoundly genuine.

This brings us to our next point this morning: 

II. Honest Faith Is Better Than Pretended Faith

As Jesus tells them to bring the boy to Him, Mark records something that first glance can almost seem unnecessary.

Mark includes this detail so there is no confusion about what is taking place.

This is not merely epilepsy or some unexplained medical condition.

Mark deliberately tells us that "the spirit saw Him."

The problem is spiritual, and the only One who has authority over it is standing in front of the boy. Notice what the spirit does when it comes in the presence of Christ, “immediately it convulsed the boy, and he fell on the ground and rolled about, foaming at the mouth."

Mark wants us to feel the weight of this moment. This is not a minor inconvenience. This is not a child simply having a bad day. This father has watched his son suffer for years. Every seizure, every convulsion, every sleepless night, every moment of fear has slowly worn him down.

Open fires and bodies of water with no fence around them are very common during this time. This father can never rest or take his eyes off his son. The demon is constantly throwing the boy into fires and water trying to kill him. Luke tells us this was his only son.

Every parent in this room understands something of that weight. There is something uniquely and horribly painful about watching your child suffer while knowing there is absolutely nothing you can do to fix it.

And notice what Jesus does. He doesn't immediately cast out the demon.

Instead He asks a question."How long has this been happening to him?"

Church, Jesus already knows the answer. The One who knows the number of hairs on our head certainly knows how long this boy has suffered. So why ask? Jesus asks not because He lacks information but because He is revealing His compassion. The Creator of the universe pauses long enough to listen to one exhausted father tell his story. 

The father answers, "From childhood. And it has often cast him into fire and into water, to destroy him."

Can you hear the exhaustion in those words? For years this father has lived in fear. For years he has watched his son suffer. For years he has searched for answers. And after the disciples failed him, his hope is hanging by a thread.

So he says, "But if you can do anything, have compassion on us and help us."

That word “help” here is such a rarely used word. It means to run to the aid of someone who needs help or to run to the aid of someone who is calling for help. So the father is literally asking Jesus to have compassion on him and his son and run to their aid. You can hear the desperation for salvation from this father, this intense plea he is making to Jesus. 

And did you notice the shift in the father’s response? The father begins by talking about his son, but by the end of his sentence he says, "Have compassion on us." His son's suffering has become his suffering. His burden has become the father's burden.

After years of disappointment, years of frustration, years of exhaustion, after watching the disciples fail, after carrying this burden for so long the fathers faith has become wounded. His confidence has become weak. His response is raw. It is the cry of a man who desperately wants to believe but whose faith has been battered by years of disappointment. He is not questioning Christ because he wants to argue; he is questioning because he cannot survive another broken hope. So he simply says, If you can please run to my aid…

So Jesus responds,"If you can!' All things are possible for one who believes."

This response is not Jesus asking the question back to the man, rather it's like he says If you can?Are you kidding me? You have brought your demon-possessed son to me, which indicates that the father has to have known or heard about others that I have healed and freed from demon possession.

Now, Jesus is not rebuking weakness. He is redirecting the father's attention. The question is not whether Christ is able. The question is whether the father will put his trust in him. After all these years of false hopes, proven disappointments, and hoping in men, will he now put his hope in Christ.

There is an important lesson here for us. Far too often this verse is ripped out of its context and used to teach that if we simply have enough faith God will do whatever we ask.

But that is not what Jesus is saying. The power is not found in faith itself. The power is found in the One who is the object of our faith. As one scholar  rightly points out that the miracle does not depend upon the amount or quality of the father's faith, but upon his relationship of trust in Jesus.

That changes everything. Our hope has never rested in the greatness of our faith. Our hope rests in the greatness of our Savior. That is why the father's response is one of the most beautiful prayers recorded in Scripture.

"I believe; help my unbelief!"

Notice what the father does not say. He does not say, "I will come back when my faith is stronger." He does not say, "I need to eliminate every doubt before I come to Jesus." He brings his faith and his unbelief to the same Savior because he knows there is nowhere else to go. 

What honesty. What humility. He does not pretend. He does not exaggerate. He does not hide behind religious language or if he was alive today he didn’t give the right Sunday school answer.

He simply brings his broken, tired, worn out, imperfect heart to Christ. "I believe." There is genuine faith. "Help my unbelief." There is genuine weakness.

Church, that is what authentic faith looks like. Faith is not the absence of struggle.

Faith is bringing your struggle to Jesus. Faith is not pretending your doubts do not exist. Faith is refusing to let those doubts keep you from Christ.

This father believed Jesus could heal his son, but he also recognized how battered and weak his faith had become. The failure of the disciples had shaken him. Years of suffering had exhausted him. Yet he still runs to Jesus.

And Jesus does not turn him away. What encouragement that should bring to every believer. Some of you walked into church this morning carrying burdens that have slowly worn your faith thin. 

Some have prayed for years for a prodigal child. Some have watched cancer steal someone you love. Some have buried dreams, relationships, and expectations. Some have silently wondered why God has not answered yet. And somewhere along the way your confident faith has become wounded faith.

Perhaps your prayer this morning is not eloquent. Perhaps all you have left are these simple words: "Lord, I believe; help my unbelief."

Church, don’t miss something wonderful here, Jesus never rebukes that prayer. He welcomes it. He is not intimidated by weak faith. He is not surprised by our doubts. He is not frustrated when exhausted believers come honestly before Him. 

In fact, I would argue that honest faith is infinitely better than pretended faith. Because pretending strength keeps us depending on ourselves. It keeps our eyes off of Christ and on ourselves and whatever valley we find ourselves in. Honest weakness drives us to Christ, and forces our eyes out of the valley of doubt and back onto the One who is sufficient.

Church, the beautiful truth is that the story does not end with the father's confession. Mark does not leave us with a man struggling to believe; he shows us Jesus who is worthy of putting our hope in. The father has confessed his weakness, now Christ will demonstrate His sufficiency. And what Jesus is about to do proves that our hope has never rested in the perfection of our faith but in the perfection of our Savior.

This brings us to our final point this morning:

III. Christ Is Sufficient for What Man Cannot Do 

So, while Jesus is having this conversation, the crowd starts to swell, verse 25, and Jesus saw that it was rapidly gathering and it’s time to act. The word is spreading that He’s there, the crowd is swelling. He decides to cut the conversation, not because of the chaos, not because of the commotion, He was used to that, but because of the fact that His public ministry was over. He is not the public healer anymore. That part of His ministry is in the past. He’s not going to wait for the crowd. He’s not attempting to prove anything to the crowd. He wants no more publicity than is necessary because the emphasis now is on instruction for His disciples. 

He rebukes the unclean spirit saying, "You mute and deaf spirit, I command you, come out of him and never enter him again." The father only described a mute son, yet Jesus addresses a deaf and mute spirit. Even incomplete information does not limit the knowledge of Christ. Just as weak faith did not limit His power, incomplete understanding does not limit His grace. He knows far more about our need than we could ever explain.

Even incomplete information, like the man’s fractured faith, does not limit Jesus' power, grace, and mercy to save. Notice there is no struggle. No debate. No contest. No uncertainty. One command. Absolute authority. The demon has no choice but to obey.

Back in Matthew chapter 12 verses 43-45, Jesus says at times when a demon leaves a person's body it is possible for 7 more to come back and in the end the person is worse than when they started. But Jesus would see this boy completely free from all oppression. Remember that since childhood this boy has been under attack, and the father has had to struggle to care for his son his whole life. And now in this one moment, Jesus commands the demon to come out and never return.

This demon like the one in Chapter 1throws one final fit or protest before coming out. With one final violent protest the demon throws the boy into terrible convulsions before leaving forever. Even its last act of rebellion only serves to demonstrate that Christ's authority is absolute. These convulsions must have been so violent that the boy looked like a corpse lying on the ground that the crowd began saying, "He is dead."

Can you imagine what must have gone through that father's mind? Only moments before he cried, "I believe; help my unbelief." Now the son he brought to Jesus lies motionless on the ground. From every human perspective the situation looks worse than before. Church, have you ever experienced that? You finally surrender something to God. You finally trust Him. You finally begin praying faithfully. And before the answer comes, everything seems to get worse.

But appearances are often deceptive. Because Jesus is not finished. Mark simply tells us, "But Jesus took him by the hand and lifted him up, and he arose." Those words should sound familiar. 

Throughout Mark, Jesus reaches down to those who cannot help themselves. Here He takes what appears to be a lifeless boy by the hand and raises him up, giving us a small preview of the greater resurrection He will accomplish through His own death and resurrection. 

This boy is not the only helpless one in the story.

The helpless boy in the valley becomes a picture of every helpless sinner apart from Christ.

Spiritually speaking, we all entered this world helpless. Dead in trespasses and sins. Unable to save ourselves. Unable to free ourselves. Unable to rescue ourselves from the power of darkness. 

But Jesus stepped into our valley. He entered our brokenness. He defeated death. He conquered sin. And through His death and resurrection He takes spiritually dead sinners by the hand and raises them to new life. 

Then Mark records one final conversation. They move from the scene of the healing into a private house. Away from the noise and distraction of the crowd. Remember Jesus is teaching them to walk by faith as their time with Him is coming to an end soon. So Jesus disciples them quietly and privately.

Once they are alone, the disciples ask the obvious question: "Why could we not cast it out?" They had been given authority over unclean spirits before, so why had they failed? Jesus answers with one simple statement: "This kind cannot be driven out by anything but prayer." 

Jesus makes it clear that prayer is the road faith travels on.

Prayer is not a formula, a ritual, or magic words that force God's hand. Prayer is dependence. It is the confession, "Lord, I cannot do this, but You can." The disciples had experience, authority, and previous success, yet they had begun relying on themselves instead of Christ. How often do we do the same? We trust our education, our experience, our parenting, our ministry, our plans, our programs, and our own strength until God lovingly reminds us that apart from Christ we can do nothing.

I want us to understand that this is not weakness. That is biblical faith. The disciples failed. The father's faith faltered. The crowd doubted. The boy was helpless. Yet through it all Christ remained completely sufficient.

Matthew records one detail that helps us understand why the disciples failed. Jesus tells them, "Because of your little faith" (Matt. 17:20). Notice He does not say they have no faith, but little faith. Then He points them to a mustard seed, reminding them that the issue is not the size of faith but the object of faith. In fact, the greatest example of faith in this passage is not one of the disciples but the broken father who cries, "Lord, I believe; help my unbelief." Yes, his faith is weak, imperfect, and mixed with doubt, yet he brings it to a perfect Savior. Understand, the power has never been in the strength of our faith. It has always been in the sufficiency of Christ. 

This is why prayer matters so much. Prayer is faith refusing to trust itself. Prayer is the believer confessing, "Lord, I cannot do this, but You can." 

Jesus could have allowed the disciples to succeed without prayer. He could have allowed them to think the power belonged to them. But that would have taught them the worst possible lesson.

Instead, He lovingly lets them fail so they will learn that kingdom work is never accomplished by human strength but by complete humble dependence upon Christ. And that is the lesson for us.

We are not learning a formula for miracles. We are learning that weak, struggling faith, expressed through persistent prayer, depends upon the power of God rather than the strength of man. 

Church, that should encourage every one of us this morning. Because our hope has never rested in the strength of our faith. It has always rested in the sufficiency of our Savior.

As we come to the end of this passage, notice where every person is left.

The scribes have no answers.

The crowd is filled with uncertainty.

The disciples have failed.

The father is exhausted.

The boy is completely helpless.

And yet Christ is enough. That is the story of the gospel.

The longer I walk with Christ, the more convinced I become that the Christian life is not about becoming more self-sufficient but more Christ-dependent. We spend so much of our lives trying to convince ourselves and everyone around us that we have it together. We want people to think we are strong, capable, and in control.

But this passage teaches us something entirely different. The greatest confession in this story is not, "I have great faith." It is, "I believe; help my unbelief." Maybe that is exactly where some of you are this morning.

You have been carrying burdens that have become too heavy. You have been praying for a prodigal child for years. You are trying to hold a marriage together. You are battling fear, anxiety, guilt, or disappointment. You wonder if your faith is too small and your prayers too weak.

Hear the good news of Mark 9.

Jesus is not looking for perfect people. He is not looking for flawless faith. He is not looking for those who have all the answers. He is looking for those who will come to Him in humble dependence. Because weak faith resting in an all-sufficient Savior is stronger than great confidence resting in ourselves.

And fathers, let me speak to you for just a moment. The world tells you that you must be the hero of your home. That you must carry every burden, fix every problem, have every answer, and never let anyone see weakness.

But Scripture tells us something far better.Your family does not need a perfect father. They need a father who knows where to run when he is weak. They need a father who gets on his knees in prayer. A father who opens his Bible. A father who is humble enough to say, "I don't have all the answers, but I know the One who does."

Your children do not need to grow up believing that Dad is sufficient. They need to grow up seeing that Christ is. Lead them to Jesus. Pray with them. Repent before them when you fail. Show them what dependence upon Christ looks like. And for every father who walks into this room carrying regrets, hear this clearly: your failures are not greater than the grace of God.

The same Savior who took that broken boy by the hand still takes broken sinners by the hand today. He still restores. He still forgives. He still strengthens. He still saves. So whatever valley you find yourself in this morning, stop looking at the size of your faith and start looking at the greatness of your Savior.

Bring Him your doubts. Bring Him your fears. Bring Him your failures. Bring Him your family. Bring Him your children. Bring Him your weakness. 

And trust that the Christ who was sufficient for a desperate father, sufficient for failing disciples, and sufficient for a helpless boy is still sufficient for His people today.

Because our hope has never rested in the strength of our faith. It has always rested in the sufficiency of our Savior.