He said to them, “Because of your little faith. For truly, I say to you, if you have faith as a grain of mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible to you.”
And Jesus answered them, “Truly, I say to you, if you have faith and never 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 cast into the sea,’ it will be done.
And the Lord said, “If you had faith as a grain of mustard seed, you could say to this sycamine tree, ‘Be rooted up, and be planted in the sea,’ and it would obey you.
And his name, by faith in his name, has made this man strong whom you see and know; and the faith which is through Jesus has given the man this perfect health in the presence of you all.
He did not weaken in faith when he considered his own body, which was as good as dead because he was about a hundred years old, or when he considered the barrenness of Sarah's womb.