I read recently, "God didn't create a mission for His church, He created a church for His mission."
His mission is to reach as many people as possible, as quickly as possible. In order to accomplish HIs mission, we are to be a relentless church because we do have the only real answer to the puzzle of life that people around us are seeking to put together.
The Gospel was never meant to be passive. Matthew 5 makes it clear, "Your lives light up the world...So don't hide your light! Let it shine brightly before others..."