There is a connection between releasing the power of God and speaking. It takes true faith, power of the tongue and unity with God for miracles to happen. In the book of James it talks about the tongue being like a rudder, but what empowers the tongue is what is in the heart. All miracles are to show the power of God. When we hear God telling us to do something, no matter how strange it seems, when we obey our miracle will happen. When we learn to discern by the Holy Spirit on things to do miracles will happen.