Dr. D. Stuart Briscoe is an evangelical Christian author, international speaker and the former senior pastor of Elmbrook Church, in Brookfield, Wisconsin
I recommend How to Be a Motivated Christian whether you are feeling like an unmotivated Christian or you think you are just fine. Each chapter deals with how or why we should be motivated. Very insightful, he uses clear and sometimes funny examples, and it is full of pertinent scripture. I initially thought I wouldn't find this useful, just my own misconception of course. I found it full of enlightening points. Stuart Briscoe definitely got his point across in How to Be a Motivated Christian, all we have to do is apply it.