Worry and fear are negative emotions that serve no useful purpose. Worse, they are not benign influences on your behavior. Both tend to expand if left unchecked until they crowd out positive emotions and beliefs, taking over your mind and filling it with counterproductive emotions that cause you to doubt your ability to succeed at anything you attempt. Unless you control worry and fear, one day you will discover that they control you. While the emotions can’t always be corrected with logic or reason, they are always susceptible to action. Act, and even if your actions aren’t entirely appropriate for the situation, the very act of doing something — anything — constructive will have a positive effect on your mind and attitude.