The purpose of calls is to summon adherents away from their daily grinds to a new level of awareness, into a sacred frame of mind, into communion with that which is bigger than themselves.
As Martin Buber has said, "living means being addressed." A call is only a monologue. A return call, a response, creates a dialogue.
This dynamic and more open perspective is like putting on a lens through which we can see our lives as a process of calls and responses.