So many things in the media today challenge the purity of our hearts and mind. We are told that it's okay to gossip. The media tells us that it's okay to tell a "small" lie to get what we want. Songs, movies, books... the list goes on.
We should strive to be pure, and that starts with the condition of our hearts. We can't rely on feelings, because feelings change all of the time. The media tell us to live for the moment, and to do what makes us feel good.