WPNT(i)
14 As they came to the crowd a man approached Him and kneeling to Him said:
15 “Lord, have mercy on my son, because he is moonstruck and suffers badly! For he often falls into the fire and often into the water.
16 So I brought him to your disciples, but they could not cure him.”
17 Then in answer Jesus said: “O faithless and perverse generation, how long must I be with you? How long must I put up with you? Bring him here to me.”
18 And Jesus rebuked the demon and it came out of him, and the boy was healed from that very hour.
19 Then the disciples came to Jesus privately and said, “Why were we not able to cast it out?”
20 So Jesus said to them: “Because of your unbelief; for assuredly I say to you, if you have faith like a mustard seed has, you (ye) will say to this mountain, ‘Move from here to there’, and it will move; and nothing will be impossible for you.
21 However, this class does not go out except by prayer and fasting.”