And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.
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Matthew 17:18-22
Tyndale Open Study Notes (CC BY-SA 4.0).
17:20 Here, the expression don’t have enough faith is virtually synonymous with no faith. • faith even as small as a mustard seed: This could mean that if the disciples had even very little faith they would be able to accomplish great things (21:21; cp. 1 Cor 13:2). It could also mean that if they would allow their faith to grow (see Matt 13:31-32), they could act with courageous belief. • Moving mountains is an adage for overcoming obstacles and fulfilling God’s purposes (Isa 40:4; 49:11; 54:10; 1 Cor 13:2).
Other Bible passages linked to this one, most cited first.
And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.
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.
For with God nothing shall be impossible.
And he said, The things which are impossible with men are possible with God.
Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.
Jesus said unto him, If thou canst believe, all things are possible to him that believeth.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.