The Difference Between a "Can Do" Church and a "Can't Do" Church

Every church has an organizational culture. Some churches have a culture of optimism. You can feel the energy in worship. Others are pessimistic. You can sense the deadness when you walk into the sanctuary. What is the difference between churches that approach obstacles with a “can do” attitude over others that have a “can’t do” attitude? What makes a church have a lively optimism over a dead pessimism?