The identity wars audio series is an absolute gem, the deep concepts explored and answered are the "hearts longing", I recommend this to anyone who wants a deeper connection and understanding of the "why's" and "how's" of the Christian walk....and want that ultimate connection with his Saviour.
I just had a privilege of reading Ruben’s book Faith Journey. In this book, he tries to answer the question on the difference between the Covenants so as to understand the gospel, and also illustrates the difference between living carnally versus living spiritually.