As Jesus went on from there, two blind men followed him, crying loudly, “Have mercy on us, Son of David!” When he entered the house, the blind men came to him; and Jesus said to them, “Do you believe that I am able to do this?” They said to him, “Yes, Lord.” Then he touched their eyes and said, “According to your faith let it be done to you.” And their eyes were opened. Then Jesus sternly ordered them, “See that no one knows of this.” But they went away and spread the news about him throughout that district. (Matthew 9:27-31, NRSV)
Do you believe Jesus is able to heal you?
Wow, it is all on me now, so if I ask for God to heal someone and they are not healed then it is my fault because I did not believe. I think we get skeptic of things. If we can have faith that God will do what we ask, if it is in His will, then it will be done. I think it is not only up to our belief but also to God’s will.
So do you believe? I believe God can and will do miracles in our lives every day.
aSacredRebel 
But also in Mt 17 we have:
Then the disciples came to Jesus privately and said, ‘Why could we not cast it (the demon) 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.’*
Which I believe is Jesus saying that the faith they have is enough to do what He has for them to do. If they had more they could move mountains, but they don’t need to be able to do that. It’s not saying their faith is insufficient but is what they need.