Jesus said a variation of the same idea most of the time people came to him for healing.
Matthew 8:13 Then Jesus said to the centurion, "Go! As you have believed, so will it be done for you." And his servant was healed at that very hour.
Matthew 9:29 Then He touched their eyes and said, "According to your faith will it be done to you."
Matthew 15:28 "O woman," Jesus answered, "your faith is great! Let it be done for you as you desire." And her daughter was healed from that very hour.
Mark 5:34 "Daughter," said Jesus, "your faith has healed you. Go in peace and be free of your affliction."
Mark 10:52 "Go," said Jesus, "your faith has healed you." And immediately he received his sight and followed Jesus along the road.
Luke 17:19 And He said to him, “Stand up and go; your faith has [n]made you well.”
Then when he taught on faith he said this.
Matthew 13:31 He presented another parable to them, saying, “The kingdom of heaven is like a mustard seed, which a person took and sowed in his field; 32 and this is smaller than all the other seeds, but when it is fully grown, it is larger than the garden plants and becomes a tree, so that THE BIRDS OF THE SKY come and NEST IN ITS BRANCHES.” 33 He spoke another parable to them: “The kingdom of heaven is like leaven, which a woman took and hid in three sat of flour until it was all leavened.”
The word "hid" is also translated as "mixed into." Faith doesn't make God do something, he's already offered everything in Christ. Faith makes the effort to mix Christ into the area that needs healing. How will you mix the word of Christ into your issue? Once you do, it will work its way through the whole thing and bring healing.