Can Faith Move Mountains?

“And seeing this, the disciples marveled, saying, ‘How did the fig tree wither at once?’ And Jesus answered and said to them, ‘Truly I say to you, if you have faith, and do not doubt, you shall not only do what was done to the fig tree, but even if you say to this mountain, “Be taken up and cast into the sea,” it shall happen. And all things you ask in prayer, believing, you shall receive’” (Matthew 21:20–22).

When the disciples passed the cursed fig tree the next morning and saw that it was “withered from the roots up” (Mark 11:20), they marveled, saying, “How did the fig tree wither at once?” A diseased tree might take many weeks or months to die, and even one that had been salted, either by accident or from maliciousness, would take several days to die. For the fig tree to wither overnight was to do so virtually at once. . . .

http://www.macarthurcommentaries.com