Sometimes worrying can be helpful; sometimes it can be disastrous. When we see a yellow light and worry about stopping for a traffic signal, we are motivated to put a plan into action, braking, and we are benefitted by our worry. We are not injured in an accident. If, after passing safely through the intersection, we continue to worry about what would have happened if the brakes failed, then worry ceases to be a good thing. The gist of the matter is that worry, followed by action is a good thing. Continuous worry, without constructive action, is counterproductive.
Read the entire article here: Don’t Worry, Be Happy: Good Advice or Bad?