When Jesus said, “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” (Matthew 17:20), He wasn’t telling His disciples they needed more faith. He was telling them that the amount of faith was never the problem — genuine faith, however small, is enough, because its power comes from the God it’s placed in, not from its own size.
New Year’s resolutions often collapse under their own weight within weeks — too ambitious, too dependent on willpower that runs out. Jesus’s teaching about mustard-seed faith speaks directly into that same trap, just in the language of belief rather than habit: the mistake isn’t having too little. It’s measuring the wrong thing.
The Situation Behind the Verse
The context matters. Jesus’s disciples had just failed to heal a boy with a severe seizure disorder, and afterward they asked Him privately, “Why couldn’t we drive it out?” (Matthew 17:19). His answer wasn’t a rebuke for insufficient effort. It was a diagnosis of a misunderstanding: “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).
Read carefully, Jesus isn’t saying “you need faith the size of a mustard seed, and yours is smaller than that.” He’s saying the opposite: mustard-seed-sized faith — proverbially the smallest seed a first-century farmer would plant — is already sufficient. The disciples’ problem wasn’t a faith deficit measured in volume. It was faith misdirected, or perhaps not genuinely exercised at all in that moment.
Why the Mustard Seed, Specifically
Jesus uses the same image elsewhere, in the parable of the mustard seed: “though it is the smallest of all seeds, yet when it grows, it is the largest of garden plants and becomes a tree” (Matthew 13:31-32). The point in both places is the same: size at the start has almost no bearing on what the thing becomes. A mustard seed doesn’t need to be large to produce a large plant — it only needs to be planted, and to be genuinely alive.
Applied to faith, this means the question was never “how much faith do I have?” as though faith were measured in liters. The question is whether the faith that exists — however small it feels — is real and rightly placed. A small amount of trust in an infinitely powerful God moves exactly as much as a large amount of trust in the same God, because the power was never coming from the size of the faith in the first place.
Not a Formula for Getting What You Want
It’s worth being careful here, because this verse gets misused. Jesus is not describing a technique where enough sincerity guarantees any outcome a person wants — mountains literally relocating on command isn’t the point, and no biblical author treats it that way. Mark’s version of a similar teaching frames it around prayer aligned with God’s will and forgiveness toward others (Mark 11:22-25), not raw willpower. The “mountain” is best read as a figure of speech for whatever obstacle feels immovable — a stubborn illness, a hardened relationship, a seemingly hopeless situation — not a literal geological claim, and not a promise that any request, sincerely made, will be granted exactly as asked.
What This Means Heading Into a New Year
For anyone entering January feeling like their faith is too weak, too inconsistent, or too small to matter, this teaching is aimed directly at that discouragement. Jesus never asked His disciples to manufacture more faith before He would act. He asked them to bring what little they actually had honestly — even a father in another Gospel account managed only, “I do believe; help me overcome my unbelief!” (Mark 9:24), and that admission was enough for Jesus to heal his son on the spot.
What Scripture Says About Small Beginnings
Zechariah asks rhetorically, “who dares despise the day of small things?” (Zechariah 4:10) — a direct challenge to the instinct to dismiss anything that starts small. Paul writes that God’s power “is made perfect in weakness” (2 Corinthians 12:9), locating strength in God’s action rather than human capacity. And Jesus’s own promise, “According to your faith let it be done to you” (Matthew 9:29), spoken to two blind men who asked for healing, shows the same pattern: not the size of their faith being tested, but simply whether it was there and directed toward Him.
Frequently Asked Questions
What did Jesus mean by “faith like a mustard seed”?
That even a very small amount of genuine faith in God is sufficient — the power behind the outcome comes from God, not from the size or intensity of a person’s belief.
Is Matthew 17:20 a promise that any prayer will be granted?
No. It’s best understood alongside passages like Mark 11:22-25, which frame effective prayer around alignment with God’s will and a forgiving heart, not a formula guaranteeing any requested outcome.
Why does Jesus use a mustard seed specifically?
Because it was proverbially the smallest seed a farmer would plant, yet grows into one of the largest garden plants — illustrating that small beginnings can produce results far beyond their apparent size.
Final Thoughts
Heading into a new year, it’s tempting to think spiritual growth requires a dramatic increase in faith before anything can change. Jesus’s teaching says otherwise: bring the small, honest faith that’s actually there, and trust the God it’s placed in to do the rest. That was always the point of the mustard seed.
Start the Year in Community
Wherever your faith feels small right now, you don’t have to carry it alone. Join a prayer group near you.
General devotional content (Matthew 9, 13, 17; Mark 9, 11; Zechariah 4; 2 Corinthians 12); no organization-specific claims. Compiled by the Editorial Desk.