Jesus is the Word of God. You are a specific word from God. He is the rock upon which we are built and we are a stone placed upon the structure.
David was a type of Christ taking on the Devil and the world system. You are a stone in davids sling. You have a target you must hit. A battle to fight. A giant to slay. Right now it may be a battle in your mind or in your work or your family or body. It does not matter. One single word from heaven can turn your situation around.
God has much to say to this generation and you are a portion of that utterance. Your life delivers a specific aspect of the Word God is speaking.