Of the Ten Factors, Activity is the actual change brought about through power. It should be pointed out that things will not necessarily be done just because someone or something has the power to do them. Nothing exists by itself and nothing happens in a vacuum. In order to have an actual effect on the world, the right circumstances must exist. These circumstances, based upon the power of the beings involved, call forth the appropriate activity or response to produce the actual effect. A match will not light itself. It must be struck against a wall or a match box first.