What does it mean to testify? To testify is to declare publicly what God has done in your life. What happens when we testify? The word testimony comes from the root word: Do again. So when we testify, the first thing that happens is Jesus does the miracle again. If you testify that God has healed you from cancer, He will heal someone else from cancer. Every time we testify you are telling Jesus to do it again. When you don't share your testimony you are stealing somebody else's miracle. When we testify, Jesus receives the glory. Our testimony tells everyone that satan is defeated.