Power, cf. appropriate
Steve Blankenship, Source unknown
One New Year's Day, in the Tournament of Roses parade, a beautiful float suddenly sputtered and quit. It was out of gas. The whole parade was held up until someone could get a can of gas.
The amusing thing was this float represented the Standard Oil Company. With its vast oil resources, its truck was out of gas.
Often, Christians neglect their spiritual maintenance, and though they are "clothed with power" (Luke 24:49>) find themselves out of gas.