Please understand that it was not the ordinary stone that killed Goliath, it was the words that David spoke before releasing the stone that did the job. What are you constantly saying in the face of challenges. What you say before releasing the word of the LORD is what will kill that giant that has over-powered you. David simply gave a testimony of how God delivered him from the bear and the lion in the past before he released the stone. Your past testimonies is what activates the present testimony. God has done something for you in the past before, keep saying it in the presence of that unchanging challenge and it will end in the precious name of Jesus Christ. Let your words be filled with testimonies from today in Jesus name. Isaiah 8:20. Just as they overcame him by the blood of the lamb and with the words of their testimonies, as you keep thinking and sharing testimonies, you will keep overcoming in Jesus Mighty name.