Lewis also talked about the impulses in our lives. We all live our lives with impulses or instincts. Our impulses may at sometimes be right but its how we act upon those impulses and determine the moral code of it. In class the example was brought up of a father wanting to kill someone who hurt his son, but acting upon that feeling is not the right answer. We need to leave things up to God to kill that person or not. If we find ourself with two instincts that are in conflict, it is up to us and God to decide between the weaker one, a lot of the time we feel like it is our duty to act and make the right decision but we need to remember to let God in.
Back to the metaphor of the piano, you can't just pick up on one feeling or instinct, just like you can't just listen to a song only by hearing one note. You need to look at the bigger picture in the whole situation, just like you need to listen to the whole piece of music in order for it to sound good. So many of us just focus on the differences between religion practices, Mere Christianity reminds us that we need to look at the whole picture and recognize our similarities as a whole christian family.