Proverbs 16:23-24

The heart of the wise instructs his mouth (in wisdom) and adds persuasiveness to his lips.  Pleasant words are like a honeycomb, sweet and delightful to the soul and healing to the body.

Our words are the sword to the battle.  David came at Goliath with words before he ever threw a stone.  If a battle looms large, we need to take out our sword of the word and speak it.  Our words were spoken to either remove the problem or make it seem more significant.  We need to practice speaking the word and building ourselves up, so victory comes when we throw our stone.