Matthew 17:20 says it is because they had so little faith:

Then the disciples came to Jesus in private and asked, “Why couldn’t we drive it out?” 20 He replied, “Because you have so little faith.

But then Matthew 17:21 says

He replied, “This kind can come out only by prayer

Mark 9:29 says the same as the above. So what is the reason the disciples couldn't drive out the demon, a lack of faith or lack of prayer?

1 Answer 1


NIV Mark 9:

28 After Jesus had gone indoors, his disciples asked him privately, “Why couldn’t we drive it out?”

29 He replied, “This kind can come out only by prayer.”

NASB 1995 Matthew 17:

19 Then the disciples came to Jesus privately and said, “Why could we not drive it out?” 20And 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. 21[“But this kind does not go out except by prayer and fasting.”]

Could the disciples not drive out the demon because of lack of faith or because of lack of fasting and prayer?

Yes, all of the above.

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