Being Positive doesn’t cost you anything, but being negative can cost you everything.
Show up each day with a bright outlook. Don’t cloud your work space with a doom and gloom attitude. If something doesn’t go the way you want it to, maybe there is a good reason for the alternative outcome. Don’t let a small happenstance change your outward persona. Your mood, whether positive or negative, will almost always be reflected in those around you. Your co workers, management, and customer base; all feed off of you to some extent.