About six months ago I was told about a new little book by Christopher Ash titled Zeal Without Burnout. The book was helpful, practical, and easy to read. Reading the book was like sitting down with a wise counselor applying the truths of God's Word to your own heart. You can purchase the book by clicking here.
Christopher Ash spoke on this topic at the Basics Pastors Conference in 2014 at Parkside Church. Watch it here: