I think it is about a person that had everything at one time and just knew he 'held the key' to life (or that which many believe is the key, I. E.: money, power, fame) it was abruptly stripped away (shattered windows and sound of drums, wicked and wild wind). That is when reality set in. What he thought were his 'pillars' of strength (his supposed allies, friends and/or fans), he now knows never were true companions. He now feels alone and also guilty for not being an upstanding or moralistic human being while everyone was watching (I know Saint Peter won't call my name) Now. He realizes what he has become. (be my mirror my sword and shield). He knows he must look within himself to make a change and prove himself as an individual rather then 'a king'. He believes only he can protect himself from himself. Once that change is made, he will hold the key to life and earn true friends and companions with which to continue through this life and thereafter happily (I know St Peter "will" call my name).