"Death and life are in the power of the tongue, and those that love it will eat it's fruit" (Proverbs 18:21). That verse has really helped me a lot, because it made me realize how powerful our words are, and how everything we speak can either bring life or death. Jesus says that by our words, we are justified, or condemned. He said that one day, each one of us will have to give an account for every single thing we do and say and think. And it says that we overcome Satan by the blood of the Lamb, and the word of our testimony.
Our words are SO important! :)