Communication in any form is used for exchange of information. The links called words make communication work. Without words its difficult to imagine how we could have come so long in the history of human evolution. Word is not only a 4-letter thing, but it is something deeper than that.
Whenever a word is uttered it is due to synchronization of lip movement and tongue movement. To get out that word from our mouth, a lot of thinking and analysis has been happening in our sub conscious mind. We don't realize it because all this happens in less than one millionth of a second. Most of the times we don't think over what we have uttered. Word is not only a link, but it initiates response from the listener.
The word, which we have uttered, acts on every part of the listener's body. Like if u share a joke using a group of words, u make the listener to laugh. He may pound his hands and fist and then calm down. The very word which u have uttered has allowed him to flush his emotions out in the form of laughter or smile. If you talk about a tragic incident, the listener may close his eyes for a second and offer his condolences. Words uttered vibrate on the mind of the listener. It acts on his mind. Selection and thought prior to communication is very important.
Sometimes we say things which we shouldn't have or we carelessly utter unwanted words (mind you I am not talking of abuses). These things may affect the other person emotionally and mentally. For us it would have been just a matter of second to wag our tongue, but for the listener it is going to be the only thing at the back of his mind. By using unwanted words or speaking more than necessary, we not only hurt someone, but we also add a spot of dust to our social image. Your future interaction with the person may be based on that single word. Using proper words while talking is just like selecting the items listed out by your mom from the supermarket. You select the best brand from the specific domain, where your item is found.
So guys watch before you speak because the actions of the listener may be louder than your words!