How Do We Know Right from Wrong?

Thomas has made a poor choice. He knows he sinned, and he can’t sleep for the guilt he’s feeling. So he sits down with Grandpa for a late-night heart-to-heart talk, and together they tackle some tough questions: Who decides what is right and what is wrong? How do we know the difference? And when faced with a choice between the two, how can we always choose to do what is right?