In Matthew 9: 27-30, we find the example of faith of two blind men who came to Jesus Christ to ask for healing. When they did, Jesus asked them, "Do you think I can do this?" And then they answered: "Yes, Lord." "Then he touched their eyes, saying: According to your faith be it done unto you."
The faith of these men that Christ could heal them became the reality they desired. In addition, he gave them the certainty or confirmation that they would receive what they asked for. These men believed, for they had faith in what would happen in the future.