How much time and energy do we spend wishing things were how they used to be? We often think about times in our past when things were different and want our lives to be like that again. Some of us have even come to believe that our best days may actually be behind us. But if we're in some way hung up on the past, what does that mean for our lives now? How are we and those around us affected if we're not fully present? If we're longing for the way things used to be, what does that really say abou...