I thought that the theme of sacrifice was very compelling this week. I like seeing Desmond from this spiritual angle, with visions and callings, which makes his character so much more complex. It is clear that Penny is the most important thing in the world to Desmond and he was contemplating sacrificing Charlie's life in order to find her. But Desmond's good nature stepped in the way and reversed the sacrifice. Even though it was not Penny, Desmond was willing to sacrifice saving her in order to save Charlie, which shows that he actually would have made a great monk.
I noticed also a lot of attention on the Isac and Abraham story from the bible and Desmond's concentration on how its all a test. He had to be willing to kill his own son in order to prove himself. I think this almost foreshadow's Charlie's fate. I feel like Desmond is going to have to either let the events fall into place without interfering or he is going to have to sacrifice his own life and die in the same manner Charlie is supposed to in order to cancel it out. Those are just some of my thoughts, what do you guys think?