We will all face many transitions in our lives. Some will be happy and exciting-whether it's a new job, a move to a different city, a marriage, or the birth of a child. Others-the death of a parent, an empty nest, a divorce-will be deeply painful. In both cases, crossing the threshold between a 'room' in our life that feels comfortable and familiar and one that feels uncertain and unpredictable can be scary. Hirsch believes that the decisions we make...