A Question of Faith
Matthew 17:14-21
Faith is so vital to the Christian life that Scripture tells us that, without faith, it is impossible to please God (Heb. 11:6). The Bible tells us that salvation is the gift of God through faith (Eph. 2:8–9). Paul writes that in the gospel, “the righteousness of God is revealed from faith to faith; as it is written, ‘The just shall live by faith.’” (Rom. 1:17). In other words, we are not only saved by faith, we live our whole Christian life from beginning to end “from faith to faith.” From day one of our journey of faith until the very last day, the righteous live by faith. Whether we are brand-new followers of Christ or seasoned, mature believers who have walked with the Lord for many years, we must trust God “from start to finish” and rely on His mighty power—the power of the gospel—to change our lives and the lives of those we encounter.
In our passage today, Christ told His disciples that, with just a tiny measure of faith, the size of a mustard seed, they could move mountains and “nothing will be impossible for you” (Matt. 17:20). That word “impossible” means literally “not to have strength, power, or ability.”[1] The root word is the verb δύναμαι (dynamai) meaning “to be able, have power.”[2] We get the English word “dynamic” from this Greek word. Matthew uses this word in Matthew 17:16 when the father of the boy literally says that the disciples “were not able” or “had no power” to heal his son. In Matthew 17:19, the disciples then literally ask Jesus “Why were we not able to cast it out?” using this same verb.[3]
Matthew’s repetition of this word underscores the theme of “ability” or “power” to do something or the lack of it. And Jesus says the difference between being able and being unable is faith. I believe that this is the great lesson this passage is meant to teach us. We are unable to do anything for Jesus apart from an utterly dependent faith in Jesus.
This lesson in faith occurs right after the transfiguration (Matt. 17:1-13). Jesus had taken three of His closest apostles—Peter, James, and John—and led them up a high mountain. There, they got a glimpse of Christ’s glory, a preview of the majesty of the Son of God when He comes again in power to consummate His kingdom. They saw “His face shown like the sun, and His clothes became as white as the light” (Matt. 17:2). Moses and Elijah appeared and talked with Jesus, and God the Father spoke from heaven saying, “This is My beloved Son, in whom I am well pleased. Hear Him!” (Matt. 17:5).
The disciples had confessed their faith in who Jesus is (Matt. 16:16), but they also needed to believe what He said—especially when He told them, “… the Son of Man is also about to suffer …” (Matt. 17:12) and that “If anyone desires to come after Me, let him deny himself, and take up his cross, and follow Me” (Matt. 16:24). We most often learn the best lessons on faith in times of suffering, weakness, and even failure. That is exactly where we find the other nine disciples when Jesus and the three descend the Mount of Transfiguration. They are in the midst of a multitude of people and it’s not going well. The first thing we encounter in our text is …
1. A Father’s Request (Matt. 17:14-16)
14 And when they had come to the multitude, a man came to Him, kneeling down to Him and saying, 15 “Lord, have mercy on my son, for he is an epileptic and suffers severely; for he often falls into the fire and often into the water.” (Matt. 17:14-15).
Here was a desperate father, whose son was sick and needed healing. The New King James translation says, “he is an epileptic and suffers severely” (Matt. 17:15). The Greek word translated “epileptic” is more literally “lunatic” or “moon struck”. Many ancient societies believed that that madness was caused by the influence of the moon. So, this term means that the boy was stricken with something that had driven him insane. His condition was quite dangerous, “for he often falls into the fire and often into the water” (Matt. 17:15). In Matthew 17:18 we see that his disorder was not just mental or physical, it was also spiritual. It was caused by a demon who was afflicting him. Not all sickness is caused by demons, but there are several examples in Scripture of demon possession manifesting as mental or physical affliction.
Mark’s Gospel gives us more details about the boy’s suffering saying, “And wherever it seizes him, it throws him down; he foams at the mouth, gnashes his teeth, and becomes rigid” (Mark 9:18). The symptoms of seizures like this are similar to epilepsy, and that is probably why the translators used that word to describe it. Clearly, not only was the boy suffering, but the father was also himself suffering unspeakably in anxiety over his precious son. You can feel the father’s desperation and helplessness when he says in Matthew 17:16, “So I brought him to Your disciples, but they could not cure him.”
We know from Matthew 10, when Jesus sent His disciples out to preach the message of the kingdom, that He gave them authority to heal the sick and cast out demons (Matt. 10:8). Mark records that the disciples had “cast out many demons, and anointed with oil many who were sick, and healed them” (Mark 6:13). So the disciples were not inexperienced in healing and casting out demons. They expected that they could do it because they had done it before. But now, for some reason, as they tried to cure this boy, they failed. Why? What was the problem?
You can imagine that the disciples, along with the boy’s father, were very frustrated by all of this. And they’re not the only ones who were frustrated. We see that in . . .
2. Jesus’ Response (Matt. 17:17-18)
Jesus Himself is clearly exasperated. Matthew 17:17 says, “Then Jesus answered and said, ‘O faithless and perverse generation, how long shall I be with you? How long shall I bear with you? Bring him here to Me.’” The word “generation” is the general term for the people living in a specific time and in a specific situation. It probably refers to the Jewish people as a whole who could actually see Jesus’ demonstrations of power and authority but for the most part did not believe.
He describes them as “faithless” or unbelieving and “perverse,” meaning twisted, turned away, or distorted. The attitude of unbelief prevailed among many in that generation who witnessed the coming of Christ, saw His power, and heard His teaching. They twisted what Jesus said and distorted what He did. Jesus expressed His frustration with them saying, “how long shall I be with you? How long shall I bear with you?” They should have believed in Him already.
Is our generation any better? Probably not. Praise God there are many believers today. Praise God we have many fine examples of faith, but we also live in a generation that is mostly characterized by unbelief. Think of the privileges that we have. We have the whole revelation of the word of God in our Bibles. We have churches everywhere. We have access to more teaching, books, and resources than any generation before us. We also have clouds of faithful witnesses from previous generations. And yet unbelief prevails. And how it grieves the Lord.
How about the disciples? Were the faithless multitudes having an effect on them too? Were Jesus’ disciples somehow faithless? Is that why they could not help the boy? They were believers. Hadn’t the disciples believed and confessed that Jesus was the Christ, the Son of God? Hadn’t they left everything to follow Him? Yet, they demonstrated unbelief when they tried to do Jesus’ work without depending on Jesus Himself.
Finally, Jesus tells the disciples to do what they should have done all along. He says, “Bring him here to Me.” Matthew 17:18 tells us that, once they did, “… Jesus rebuked the demon, and it came out of him; and the child was cured from that very hour.” What the disciples had failed to do, Jesus appeared to do with little effort. With a word, this unclean spirit obeyed Jesus and left the boy (cf. Mark 1:27). How many problems in life would be solved if we first brought them to Jesus? Faith comes to Jesus first, not just when we have exhausted our own efforts.
Finally, we come to the main point of this passage…
3. Faith’s Lesson (Matt. 17:19-21)
What follows the healing of this boy is a discussion between Jesus and His disciples about faith. The discussion is a little confusing at first, because Jesus seems to be saying two things at once. First, He tells them the problem is they have “unbelief” or “little faith.” But then He tells them that if they have faith as small as a mustard seed, they can move mountains. And that’s confusing, because the solution seems to be the same as the problem!
Look at the discussion. Matthew 17:19 tells us, “Then the disciples came to Jesus privately and said, ‘Why could we not cast it out?’” When we fail, it is best to do what the disciples did here—get alone with Jesus and ask, “Lord, why did I fail?”
They came to Him, and He showed them where they went wrong. “So Jesus said to them, ‘Because of your unbelief’”—or, other manuscripts read, because of your “little faith”. It was not just that their faith was small. It was because their lack of faith was misplaced, and therefore it was more like unbelief. Jesus shows them that they had been acting in their own strength and not with a conviction of their dependence upon the Lord. They had faith in their ability to use Jesus’ authority and power apart from an utter dependency upon Him. They had faith that they could do it without Jesus. They had forgotten that it was His power and that their only access to that power was by a living confidence in a present Lord, in an active dependence upon what He and He alone could do. That is faith, and in that moment, that is what they lacked.
And isn’t it the same way with us sometimes? We believe, we really do. But far too many times we think, speak, and act as if we do not believe, not really. We find ourselves simply going through the motions of the Christian faith and life, content with an outward conformity, but not living in the active conviction of the Lord’s presence, not looking to Jesus, personally, for life, godliness, and fruitfulness. C.S. Lewis admitted how often he struggled with precisely that failure, writing,
The trouble with me is lack of faith. I have no rational ground for going back on the arguments that convinced me of God’s existence: but the irrational deadweight of my own skeptical habits, and the spirit of this age, and the cares of the day, steal away all my lively feeling of the truth, and often when I pray I wonder if I am not posting letters to a non-existent address. Mind you, I don’t think so – the whole of my reasonable mind is convinced: but I often feel so.”[4]
Luther said, “Faith is nothing else but a sure and steadfast looking to Christ,”[5] How often during a typical day do you look to Christ? Probably, most of us would have to admit, not often enough. Perhaps that is why God allows us to get into frustrating circumstances and afflictions. Because it is in these times that we come to the end of ourselves, stop depending on our strength, and begin to really trust the Lord. Faith is looking to Christ.
Look carefully at what Jesus goes on to say. “… for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.” (Matt. 17:20). The mustard seed was the smallest seed that the Jewish people of that culture could know about. It was proverbially the smallest seed planted. It represents a very “small” quantity of faith, but with it they can move mountains. In other words, it is not the amount of faith that is significant, it is the object of faith. If their faith is in the right One, if they have an utter confidence in the power and authority of Jesus; and if the operate in utter dependency upon Him, then how much faith they have doesn’t matter. If Jesus commands us to order a mountain to be moved and we act in dependence on Him, it will move!
We often think about faith as an intellectual conviction or spiritual commitment, and, yes, it is that. The disciples had that. But faith is also and always must be a daily, hourly dependence on Christ, reliance upon Him, looking to Him, living in Him. When we fail to do that, we are people of little faith. Jesus said, “I am the vine, you are the branches. He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing.” (John 15:5).
Before we close this lesson, look carefully at Matthew 17:21 where Jesus says, “However, this kind does not go out except by prayer and fasting.” Some translations put this verse in a footnote because many of the early manuscripts do not include it. Mark’s account does have it in Mark 9:29. So, it definitely represents what Jesus said about casting our this demon. And it emphasizes the point Jesus has made about faith, doesn’t it? What is “prayer” but a matter of turning to God the Father, in the name of Jesus Christ, with utter dependency upon Him? What is “fasting” but a matter of turning away from a reliance upon ourselves? There is a connection between prayer and faith. Faith drives us to pray, and prayer builds faith. Do you want to be a person of great faith? Pray to our great God. Call on our great Savior. Do you want to be a person of prayer? Believe in Jesus. Trust in Him. Depend on Him for everything. Do you see how faith and prayer go hand-in-hand?
Why do we not see mountains move or people set free from spiritual bondage? Because of our lack of faith exercised by prayer. It reminds me of the great hymn by Joseph Scriven,
What a friend we have in Jesus,
All our sins and griefs to bear!
What a privilege to carry
Ev’rything to God in prayer!
Oh, what peace we often forfeit,
Oh, what needless pain we bear,
All because we do not carry
Ev’rything to God in prayer!
Have we trials and temptations?
Is there trouble anywhere?
We should never be discouraged;
Take it to the Lord in prayer.
Can we find a friend so faithful
Who will all our sorrows share?
Jesus knows our ev’ry weakness,
Take it to the Lord in prayer.
Are we weak and heavy laden,
Cumbered with a load of care?
Precious Savior, still our refuge;
Take it to the Lord in prayer.
Do thy friends despise, forsake thee?
Take it to the Lord in prayer.
In His arms He’ll take and shield thee;
Thou wilt find a solace there.
Praying is to actions of faith what exercising is to an athlete, what studying is to a student, what training is to a soldier, or what practicing is to a musician. True prayer expresses our utter dependence on the Lord. Prayer fits us for the spiritual battle. It equips us to do what Christ commands. Faith is a gift from God, but it is those who pray who receive what God gives. Listen, I know the difficulty with prayer and fasting. Prayer takes time. Fasting gives me headaches. It’s not easy. Of all the things that I do as a pastor each week, I find that my time spent in prayer to be as difficult as anything that I do.
Which brings me back to our main point: we are only able to do anything for Jesus when we have an utterly dependent faith in Jesus.
How’s your faith this morning? Is it weak and feeble? I exhort: pray. Faith doesn’t simply happen. It comes through your constant pleading to God for faith. God will give you faith if you ask. Do you ask? In Mark’s account of this story, there was a point where the boy’s father says, “Lord, I believe; help my unbelief!” (Mark 9:24). Is this your prayer?
This is how we put our faith in Jesus. He is the Son of God who died for our sins and was raised to life again. It is only in His name, by faith in His name, that we can be saved (Acts 3:16; 4:12). It is only in His name, by faith in His name, that we can do anything—anything that matters for eternity. Have you believed in Jesus?
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[1] Outline of Biblical Usage, https://www.blueletterbible.org/lexicon/g101/nkjv/tr/0-1/
[2] Outline of Biblical Usage, https://www.blueletterbible.org/lexicon/g1410/nkjv/tr/0-1/
[3] Greg Allen, Bring Him Here to Me, https://bethanybible.org/archive/2007/081907.htm. Allen pointed out this key word and its significance in his sermon.
[4] C. S. Lewis, Letters to Arthur Greeves, 398-399. Quoted by Robert Rayburn, A Puzzling Saying, Matthew 17:14-23, https://www.faithtacoma.org/matthew/a-puzzling-saying.
[5] Martin Luther, Cited in Whyte, Bunyan Characters, iv, 238. Quoted by Robert Rayburn, A Puzzling Saying, Matthew 17:14-23, https://www.faithtacoma.org/matthew/a-puzzling-saying.