Words are very powerful. This is why the Bible tells us to be careful of our words. Even when God created everything by His word, He has put power in our words as well to call things into being. A simple Yes or No has the power to save and destroy a nation, build people up or tear down. God told Adam to name the animals as a sign of authority and whatever he called the animal what was their names were. It is powerful for an unbeliever to use his words, how much more we who have authority in Christ.
Remeber wheb Jesus told the people at Lazarus' burial to keep quiet and insisted Lazarus wasn't dead but only sleeping because of the power in the word. This is why the word of God encourage us to be positive with our words and declare only what God says about us regardless of reality.
Instead to using your word to tear down won't it benefit you and the world at large if you use them to build.
There is power in your WORD!