What is 'faith as a mustard seed'?
BREAKDOWN
The phrase "faith as a mustard seed" originates from the teachings of Jesus, primarily recorded in the Gospels of Matthew, Mark, and Luke. It serves as a powerful metaphor to illustrate the immense potential and efficacy of even a small amount of genuine faith when directed towards God. In Matthew 17:20, after his disciples failed to cast out a demon, Jesus explains, "He said to them, 'Because of your little faith. For most assuredly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you.'" Similarly, in Luke 17:6, when asked to increase their faith, Jesus replies, "The Lord said, 'If you had faith as a grain of mustard seed, you would tell this sycamore tree, 'Be uprooted and be planted in the sea,' and it would obey you.'" This analogy is not about the *size* or *quantity* of human faith, but rather the *quality* and *object* of that faith. The mustard seed, though proverbially one of the smallest seeds, grows into a large bush or tree (Mark 4:31-32), symbolizing the disproportionate power released by faith rooted in an all-powerful God, capable of accomplishing what seems humanly impossible. It underscores that even a nascent, humble faith can tap into divine power for miraculous outcomes, because the power resides in God, not in the measure of human belief.
KEY TERMS
mustard seed
A proverbially small seed that grows into a large plant, used by Jesus to symbolize the initial smallness but immense potential of genuine faith.
Matthew 17:20
A New Testament verse where Jesus teaches that faith the size of a mustard seed can move mountains.
Luke 17:6
A New Testament verse where Jesus teaches that faith the size of a mustard seed can uproot a sycamore tree.
quality and object of that faith
The essence of Jesus' teaching, implying that the power of faith comes from its truthfulness and its reliance on God, not from the human measure of belief.
disproportionate power
The idea that a small, genuine faith can unleash an extraordinarily large, divine power, far beyond its initial appearance.
SCRIPTURE REFERENCES
Matthew 17:20
He said to them, "Because of your little faith. For most assuredly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you."
Luke 17:6
The Lord said, "If you had faith as a grain of mustard seed, you would tell this sycamore tree, 'Be uprooted and be planted in the sea,' and it would obey you."
Mark 4:31-32
It is like a grain of mustard seed, which, when it is sown in the earth, though it is less than all the seeds that are on the earth, yet when it is sown, grows up, and becomes greater than all the herbs, and puts out great branches, so that the birds of the sky can lodge under its shade."
INTERLINEAR ANALYSIS
Interlinear Greek
Matthew 17:20ORIGINAL LANGUAGE ANALYSIS
πίστις
faith
DefinitionTrust, belief, confidence, reliance upon.
κόκκον σινάπεως
mustard seed
DefinitionA grain of mustard.
ὄρος
mountain
DefinitionA mountain, a hill.
ἐκριζώθητι
uprooted
DefinitionBe rooted out, be pulled up by the roots.
HISTORICAL CONTEXT
In ancient Israel, the mustard seed was a common symbol for anything exceedingly small. While not the absolute smallest seed in botanical terms, it was popularly regarded as such due to its tiny size relative to the robust plant it produced. Mustard was cultivated for its seeds (used as a spice and for oil) and its leaves (for greens). The plant (likely *Sinapis alba* or *Brassica nigra*) could grow several feet tall, large enough for birds to perch in its branches, a stark contrast to its minute beginning. This agrarian context made Jesus's metaphor immediately relatable to his audience, emphasizing the dramatic, transformative growth from an insignificant start. Archaeological evidence from the region confirms the widespread cultivation of various seed-bearing plants and the agricultural understanding that underpinned many of Jesus's parables.
THEOLOGICAL INSIGHT
The theological insight of 'faith as a mustard seed' is a profound affirmation of God's omnipotence and faithfulness, rather than a celebration of human capacity. It teaches that the power to move mountains or uproot trees does not come from the *magnitude* of human faith, but from the *nature* of the God in whom that faith is placed. Even a small, genuine faith, free from doubt and directed towards God, can access His infinite power to achieve supernatural results. This principle liberates believers from the burden of needing 'great faith,' instead emphasizing the crucial importance of having *true* faith, no matter how humble its beginnings, in a God who is truly great. It calls for a reliance on God's ability and willingness to act, rather than on self-effort or perceived strength of belief.
COMMENTARY SYNTHESIS
Rashi (Jewish) (Jewish)
While Rashi's direct commentaries are on the Tanakh, the principle of 'little beginnings, great ends' (חזק ונתחזק, 'be strong and we will be strengthened') and the idea that God uses the humble to accomplish great things is a recurring theme in Jewish thought, as seen in texts like Midrash Rabba on Exodus concerning Moses' initial reluctance. The mustard seed metaphor echoes this theme by highlighting how even a small, seemingly insignificant entity can lead to immense, transformative outcomes through divine agency.
John Calvin (Christian) (Christian)
Calvin highlights that Christ is not comparing the quantity of faith, but its quality, emphasizing that even the smallest particle of true faith has an intrinsic power, not from itself, but from its object, Christ, and God's promise. He stresses that the disciples' problem was not an absence of faith, but a lack of true, unmixed faith, implying that even a tiny measure of pure faith is potent.
Matthew Henry (Christian) (Christian)
Henry notes that the comparison to a mustard seed refers to the principle of life and growth inherent in true faith, not merely its initial size. He posits that even a weak, struggling faith has the germ of divine power, which, if it continues to grow, can overcome any difficulty because it relies on the all-sufficiency of God.
Augustine of Hippo (Christian) (Christian)
Augustine often connected faith to humility. For him, the smallness of the mustard seed represents a humble, simple faith that is nevertheless genuine and potent because it relies entirely on God's grace. He would interpret 'moving mountains' as overcoming great spiritual obstacles or sins through the power of Christ.
Maimonides (Rambam) (Jewish) (Jewish)
Though not commenting directly on the New Testament, Maimonides' philosophical approach in 'Guide for the Perplexed' emphasizes that God's power is absolute and limitless. A concept like 'faith as a mustard seed' aligns with the idea that any human action, however small, when aligned with divine will, can tap into this boundless power, reflecting a fundamental principle of divine providence and human agency in a covenantal relationship.