Fire

 What does fire do?  It tends to spread.  When someone gets all fired up, as we say, they tend to spread their enthusiasm around.  Or they tend to pour themself into whatever has caught them.  Runners do this in training.  In Religion and Recovery, both spiritual paths, people tend to deepen their experience by practicing, such as service to others, talking about their experience, sharing their hope and love.  Such people are important to all those for whom the fire has gone down to smoldering coolness.  The spark is there, but it needs others to blow it back up to fire.  That is why the Spiritual is often referred to as Wind.