Power. It's one of those words that disciples rarely use in a positive sense. We talk about "power struggles" at church; we refer to the corruption that power has over those in public office; we speak of church leaders who overpower others with their temperament or charisma. It is almost as dirty a word as "liberal" or "conservative", depending on what circles you mix in! In certain contexts, the word deserves to be spoken of in harsh tones - there are power struggles in churches, and power can corrupt and it can overwhelm those "weaker" than ourselves.
Yet to me, it is one of those words that CS Lewis' master tempter, Screwtape, has sent down to the Department of Philology to be twisted in such a way that we avoid the proper use of the word, and the proper exercise of the concept.