"Do everything without grumbling or questioning, that you may be blameless and innocent, children of God without blemish in the midst of a crooked and perverse generation, among whom you shine like lights in the world."
Just imagine how much better the world would be if no one grumbled or complained at work! A tall order, but when you are tempted to be negative, recall this verse. Think how your co-workers will look up to and respect you if you maintain a positive and cheerful attitude. Not only that, but such an outlook can be contagious, truly making you to be a light in the world.