He replied, “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.”
And whatever you ask in prayer, you will receive, if you have faith.
And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.
Now faith is the assurance of things hoped for, the conviction of things not seen.
1 Corinthians 2:5
That your faith might not rest in the wisdom of men but in the power of God.
2 Corinthians 5:7
For we walk by faith, not by sight.
And Jesus answered them, “Truly, I say to you, if you have faith and do not doubt, you will not only do what has been done to the fig tree, but even if you say to this mountain, ‘Be taken up and thrown into the sea,’ it will happen. And whatever you ask in prayer, you will receive, if you have faith.”