Verse explainer
Jesus uses a vivid Jewish idiom for overcoming impossible obstacles through prayer — not a blank check for name-it-and-claim-it.
For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.
BSBTruly I tell you that if anyone says to this mountain, 'Be lifted up and thrown into the sea,' and has no doubt in his heart but believes that it will happen, it will be done for him.
The plain meaning
The verse sits inside a short exchange about the withered fig tree (vv. 20-24). The disciples marvel that Jesus's spoken word dried the tree overnight. His reply reaches back to a well-known Jewish idiom: rabbis who could solve seemingly impossible problems were praised as men who could "move mountains." Jesus is promising that the same faith-driven, God-directed prayer that cursed the tree is available to them — not that any spoken wish, on any subject, will be materially granted. The following verse (v. 24) ties the promise explicitly to prayer, and v. 25 immediately anchors it to a forgiving heart. The "mountain" is figurative for any formidable obstacle standing in the way of God's purposes, not a demonstration that verbal commands can physically relocate geography on demand.
The common misreading
What the commentators say
Gill insists the promise operates within the revealed will of God and toward the confirmation of the Gospel — not as an open warrant for any desire. He notes that the faith in view is so confident it rests as assured of the answer as if it were already in hand, which he calls "the prayer of faith" grounded in 1 John 5:14. The request must align with what God has made known he will do.
Barnes reads the mountain-moving image as a proverbial expression common among Jewish teachers for accomplishing things that appear humanly impossible. He stresses that the promise is not unconditional: faith of this quality is always directed toward what God wills, and the disciples are being encouraged to pray for great things in that register, not licensed to treat prayer as a mechanism for producing any outcome they name.
Henry connects the passage to the disciples' future ministry, where they would face obstacles every bit as immovable as mountains — hostile powers, hardened hearts, institutional resistance. The promise assures them that fervent, believing prayer is the instrument by which God removes such obstacles, provided they come without doubt and without an unforgiving spirit (v. 25), which Henry treats as inseparable from the faith Jesus describes.
The word behind it
"Doubt" (from diakrinō: to separate, to be divided against oneself). The word pictures an inner split — one part of the mind pulling toward trust, the other toward unbelief. It is not intellectual uncertainty about a doctrine but a divided will that hedges its request. The same root appears in James 1:6-8 for the double-minded man. The contrast Jesus draws is between a unified, whole-hearted reliance on God and a heart that second-guesses its own prayer.
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