Fill your mouth with the Word of God, and believe those things it says will come to pass.

"For assuredly, I say to you, whoever says to this mountain, 'be removed and cast into the sea,' and does not doubt in his heart, but believes that those things he says will be done, he will have whatever he says. Therefore I say to you, whatever things you ask when you pray, believe that you recieve them, and you will have them." Mark11v23-24