On Power

I was reading Mark 5:24-34 today for devotions. It's the story of the woman with a flow of blood, who reaches out to touch Jesus and is healed the moment her fingertips brush his robe. As I was reading, I was struck by verse 30 which says, "And Jesus, immediately knowing in Himself that power had gone out of him, turned around in the crowd and said, 'Who touched my clothes?'"

I was just very intrigued that Jesus knew that power had gone out of him, as if power was an actual thing. I looked in my Greek lexicon, and the word used (dunamis) appears to have a very concrete meaning.

So, I must ask the question. Could it be that power is not just some theoretical idea, or some vague thing used to describe a state of being, but is in fact an actual thing, capable of being shared and used properly or improperly? And if so, how do we share this thing called power (or alternately, strength or ability)?

The scope of effects this has is mind-boggling.