Robert I. Sutton
In his "Work Matters" blog at Psychology Today, Robert I. Sutton, author of "The No Asshole Rule," asserts detachment can be as important as passion for maintaining well-being. Sutton presents two main reasons: 1) human cognitive limits prevent us from being fully passionate about everything we do, so we need to be indifferent about things that don't matter; and 2) passion is a recipe for self-destruction if you are in a poisonous setting, so exercising detachment is necessary for self-preservation.
Sutton also discusses change management consultant Ann Michael's idea that passion can blind one to the big picture and be confused for license to be a jerk. He points to David Maister's confession of being an asshole when he "got overexcited and overenthused on a topic."
Passion is a hallmark of the Inner Purpose in my 7 Purposes of Wellness model. Here is an excerpt from my Introduction to Purpose eBook: