When they came to the crowd, a man came to him, knelt before him, and said, “Lord, have mercy on my son, for he is an epileptic and he suffers terribly; he often falls into the fire and often into the water. And I brought him to your disciples, but they could not cure him.” Jesus answered, “You faithless and perverse generation, how much longer must I be with you? How much longer must I put up with you? Bring him here to me.” And Jesus rebuked the demon, and it came out of him, and the boy was cured instantly. Then the disciples came to Jesus privately and said, “Why could we not cast it out?” He said to them, “Because of your little faith. For truly I tell 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 for you.” (Matthew 17:14-20, NRSV)
Why could the disciples not remove the demon?
Because of their little faith… If you have the faith the size of a mustard seed, you will be able to tell a mountain to move and it will. The mustard seed being the smallest of seeds in Jesus day. So the disciples faith was not that big!
But is this a bad thing?
If you could tell a mountain to move, would you? I would. I would be moving mountains all day, and I think God knew this. So God gave me enough faith that I would trust and believe in God and follow where God is leading me.
Having faith the size of a mustard seed is not something we need to fix, we have enough faith to do what God needs us to do.
So trust in Jesus and follow where He leads, and your faith is sufficient.