Several times in my life, a random person has used a battery as a metaphor. Once, on a frigid, pitch-black night, I was riding on the back of a friend’s black motorcycle, traveling to a prayer and praise meeting. At a stoplight, I asked why we were riding a motorcycle in freezing weather, in the middle of the night, to a home that “might” be hosting a Bible study. He turned to me and said, “_We don’t have self-charging batteries._” His metaphor stayed with me.