Here are some good posts for pastors (and others too) about burnout:
What Is Burnout and Why Is It So Dangerous? – David Murray (Crossway)
Preventing Pastoral Burnout – David Murray (Crossway)
How to Stay in Ministry Over the Long Haul – David Murray (Crossway)
4 Cultural Factors That Contribute to Our Epidemic of Burnout – David Murray (Crossway)
Most of us think we are less limited than we actually are. Such underestimating of our limitations and overestimating of our abilities results inevitably in strain, fraying, and eventually breaking.
Brian J. Mikul 