Watch your tongue - A story

There was once a king who asked one of his servants to bring him the best part of a lamb. The servant brought him the tongue of a lamb and the king ate it happily. The very next day, the king asked the same servant to bring him the worst part of a lamb. Again he brought the tongue. So the king asked him, "Why have you brought the tongue again?"
The servant replied, "Your majesty, the tongue can be the worst or the best part of any living creature because it speaks and the power of words is immense. The words that they speak make it either the best part or the worst part of their bodies."

Moral: Use your words wisely; for once they come out, you can't take them back. Your words can be a source of inspiration, comfort and happiness for people but they can also be a source of distress for others.