Our Great Patronus

I understand that the new Harry Potter movie just came out, which would make me really excited to see it, except I am on a mission and as missionaries we don't focus on popular media, rather we focus on teaching the gospel.  Even so, I happen to enjoy reading the books and watching the films--one of my favorite parts in the books is where Harry learns how to cast the patronus charm.  As the story goes, this spell, the only one powerful enough to combat the Dementors--sepulchral phantasms that steal your happiness and your soul (you know, nothing too big)--gets its power from the caster's happiest emotions.  The spell is unique to each person who calls upon it, based on their happiness, optimism, and personal experiences.  If you've read the book or seen the movie, you know just how effective this spell was for Harry in combating the darkness he faced.