"When they came to the crowd, a man came up to Jesus, falling on his knees before Him and
saying, 'Lord, have mercy on my son, for he is a lunatic and is very ill; for he often falls into the fire
and often into the water. I brought him to Your disciples, and they could not cure him.' And Jesus answered
and said, 'You unbelieving and perverted generation, how long shall I be with you? How long shall I put up
with you? Bring him here to Me.' And Jesus rebuked him, and the demon came out of him, and the boy was cured
at once. Then the disciples came to Jesus privately and said, 'Why could we not drive it out?' And He said
to them, 'Because of the littleness of your faith; for truly I say to you, if you have faith the size of a
mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be
impossible to you." (Matt 17:14-20)