Faith Like a Mustard Seed
Understanding Jesus' powerful teaching about small faith and big results
"Truly I tell you, if you have faith as small as a mustard seed... nothing will be impossible for you." — Matthew 17:20
The Power of Small Faith
In a world that celebrates big things—big faith, big churches, big ministries—Jesus' teaching about mustard seed faith offers refreshing encouragement. He didn't say you need mountain-sized faith to move mountains. He said you need faith the size of a tiny mustard seed.
This profound truth from Matthew 17:20 reveals that the power of faith doesn't come from its size but from its object. Small faith in a big God accomplishes more than great faith in a small god. This message offers hope to every believer who feels their faith is too weak, too small, or too inconsistent.
The Key Verse
Matthew 17:20 (NIV)
"He replied, 'Because you have so little faith. Truly I tell you, if you have faith as small as a mustard seed, you can say to this mountain, "Move from here to there," and it will move. Nothing will be impossible for you.'"
— Matthew 17:20
Jesus spoke these words with both correction and encouragement. He corrected the disciples' "little faith" while simultaneously encouraging them that even minimal genuine faith carries incredible power when placed in God.
The Context: Why Did Jesus Say This?
📖 The Background Story
Matthew 17:14-21 records the events leading to Jesus' mustard seed teaching. A man brought his demon-possessed son to Jesus' disciples, but they couldn't heal him. When Jesus arrived, He cast out the demon and healed the boy.
Later, the disciples asked Jesus privately, "Why couldn't we drive it out?" Jesus replied, "Because you have so little faith." Then He gave the mustard seed illustration. This context reveals several important truths:
- Failure happens even to disciples: These were the same disciples Jesus had given authority to cast out demons (Matthew 10:1)
- Faith can be weak: Even committed followers can struggle with "little faith"
- Jesus responds with teaching, not rejection: He didn't fire the disciples; He taught them
- The problem wasn't ability but faith: They had the authority but lacked the faith to exercise it
Understanding the Mustard Seed
🌱 What Makes the Mustard Seed Special?
Tiny Size
Mustard seeds are 1-2mm in diameter—among the smallest seeds in Palestine. Jesus chose something visibly tiny.
Big Growth
Despite tiny size, mustard seeds grow into large plants 8-12 feet tall. Small beginning, big result.
Shelter Provided
Jesus said birds perch in its branches (Matthew 13:32). Small faith produces big impact for others.
Living Power
Like a seed contains life, genuine faith contains spiritual power. It's alive and grows when planted.
Five Key Lessons from Mustard Seed Faith
Quality Over Quantity
Jesus emphasized genuine faith over great faith. A small amount of real faith is more powerful than a large amount of superficial faith. Authenticity matters more than magnitude.
God Is the Power Source
The mustard seed doesn't move mountains by its own power. Similarly, faith doesn't work because of its size but because of God's power. Faith is the channel, God is the source.
Small Starts Are Okay
Jesus didn't tell the disciples to go get more faith first. He said the faith they had—even if small—was enough. God can work with what you have right now.
Faith Must Be Exercised
Jesus said "you can say to this mountain." Faith must be spoken, acted upon, and exercised. Unused faith is like an unplugged lamp—present but powerless.
Nothing Is Impossible
Jesus concluded with "Nothing will be impossible for you." This doesn't mean we can do anything we want, but anything God wants we can do through faith.
Practical Application
🎯 How to Exercise Mustard Seed Faith
Start With Prayer
Ask God to help your unbelief (Mark 9:24). Honest prayer is the beginning of growing faith.
Read God's Promises
Faith comes by hearing God's Word. Fill your mind with biblical promises.
Take Small Steps
Exercise faith in small things first. God builds faith through faithful steps.
Speak in Faith
Jesus said "if anyone says." Your words matter. Speak God's promises aloud.
Remember Past Faithfulness
Keep a journal of how God has answered prayers. Remembering builds confidence.
Stand With Believers
Faith grows in community. Surround yourself with people who encourage your faith.
Frequently Asked Questions
Mustard seed faith refers to Jesus' teaching in Matthew 17:20 that even faith as small as a mustard seed—one of the smallest seeds known—can accomplish impossible things like moving mountains. The point is not the size of faith but the object of faith: God. Small genuine faith in a big God produces big results.
Jesus spoke these words after His disciples failed to cast out a demon from a boy. When they asked why they couldn't do it, Jesus explained it was because of their little faith. He then taught them that even tiny genuine faith can do impossible things. This was both correction and encouragement.
A mustard seed is approximately 1-2 millimeters in diameter—one of the smallest seeds in the region. Yet it grows into a large plant 8-12 feet tall. Jesus used this illustration to show that small faith in a big God produces big results. The contrast between tiny seed and large plant illustrates faith's potential.
Yes! Faith grows through reading God's Word (Romans 10:17), prayer, fellowship with other believers, remembering God's past faithfulness, and stepping out in faith. Like a mustard seed that grows when planted, faith grows when exercised. Start where you are and take small steps of faith.
No. Mustard seed faith doesn't mean God grants every request. Faith must align with God's will (1 John 5:14). Jesus Himself prayed in Gethsemane, "Not my will, but yours be done" (Luke 22:42). True faith trusts God's wisdom whether He answers yes, no, or wait.
Conclusion: Your Mustard Seed Is Enough
If you've ever felt your faith was too small, too weak, or too inconsistent, Jesus has good news for you: your mustard seed faith is enough. Not because of its size, but because of God's power. The disciples with little faith still accomplished extraordinary things after Pentecost. Peter, who doubted and denied Jesus, later preached to thousands and performed miracles.
Don't wait until your faith feels big enough. Start with what you have. Plant your mustard seed faith in God's promises, water it with prayer and His Word, and watch what He does. Remember: it's not about the size of your faith—it's about the faithfulness of your God.
Last updated: March 31, 2026 | Reviewed by Biblical Studies Team