Thoughts.  Or more precisely, revealing your character's thoughts within the story.  This was touched on briefly in a previous blog but it's worth another quick look.  Sharing your character's inner thoughts is a great way to reveal his/her true nature. Think of it as a window to the soul.  Thoughts are handy little helpers that can reveal inner conflict, help ramp up the action and deepen the emotional level of your character.  They allow your character to share fantasies or desire that they would never reveal out loud.  They keep the story moving forward and can foreshadow future actions or explain past exploits.  They also play very nicely against what your character is actually saying (or what others are saying), which creates a tug-of-war of feelings and adds a very important element to your story.  It's called depth.