God's voice -- pure power in the most unfathomable ways! Think of it -- He spoke and things are created. He spoke and all of creation came into existence. When God speaks, He creates. When God speaks, things happen, life is totally transformed.
In Psalm 29 David writes that God's voice breaks the proud; moves entire nations, makes, controls and moves fire; shakes the wilderness (both physical and spiritual here); gives birth, strips an entire forest full of life bare.
God never says anything insignificant. Every thing God utters is truth and transforming if we accept it.
Isaiah 55:11 says, "So shall My word be which goes forth from My mouth; It shall not return to Me empty, Without accomplishing what I desire, And without succeeding in the matter for which I sent it."
That's for your life too! Use God's word. If you read a promise, take it into your heart for your life and stand on it. No matter what you see, if it contradicts this promise, don't accept it. God's word is for everyone. Use it. Ask God to show you how because He will.