Heart or Head

Recently I have been contemplating a concept presented by John Eldredge. He suggests that when one becomes a Christian the heart is renewed. As a result he proposes that, although we don't acknowlege or act like it, our heart is actually good. That's right, good! He suggests that this is the only possible way that God could dwell in our heart. So this leaves me with another question. If my heart is good, why do I struggle so much. Well, where I've landed for now is that the problem is not with my heart but with my head. Think about it. The Bible says that we are transformed by the renewing of our mind, that we must take our thoughts captive, and that we need to think about pure things. So, maybe John Eldredge is right and my heart is good, and believe me that is GREAT news. However, I need to focus my mind on Him and His purposes in order to live out God's dwelling in my heart. Hmmm....