How to Think Before Speaking

"... this innate ability is often the source of consternation when what we say on the spur of the moment is something we later wish we had either not said, or said differently; it happens to everyone, sometimes, the trick is to remember when. Typically, this happens when we are responding quickly in stressful situations, or during confrontation, ..."

http://www.wikihow.com/Think-Before-Speaking