Very useful and got me thinking about a lot of deep questions dealing with the destruction of sin by the Spirit and what that looked like practically in Christian believers. This was a very hard read due to the time gap (written in the 17th century). For those that are looking trudge through this book - I definitely recommend Fallen and Flawed's Monster Cheat Sheet of this book here - http://fallenflawed.com/mortification-sin-cheat-sheet/