People often say things without even thinking before they speak. Once the words leave the tongue, the damage is done, they cannot be taken back. Make no wonder the Psalmist asked the Lord to set a watch before his mouth and to keep the door of his lips. We have to be careful what we say. If we can't speak things that are good, we shouldn't speak at all.
James described the tongue as being "evil," and "full of deadly poison and unable to be tamed." A little child will copy what they hear their parents say. We should only say what we feel Jesus would say. The world is listening, what is it hearing? Proverbs 12:22 (NIV) says that the Lord detests lying lips, but he delights in men who are truthful. God is watching and he hears our every word. What kind of lips and tongue do you have? One that speaks words of love or one that just speaks. Think about it! (SELAH...meaning think on this)