Mark 1:40-41
40 A leper came to him, begging on his knees, "If you want to, you can cleanse me."
41 Deeply moved, Jesus put out his hand, touched him, and said, "I want to. Be clean."

Notice that it wasn’t that the leper said just the right words, no he asked Jesus: If you want to. So it wasn’t a case of doing the right thing to get himself healed no, it was up to Jesus to do what He wanted to. I have been approached many times by those who think that if you say to right thing then God will act and it doesn’t work that way. There again it’s our will verses His will. Let me ask you, whose opinion did God depend on when He created the World?