Are we doomed to gloom?

I wonder. If it’s humanly possible. To keep one’s mind. Occupied. Exclusively. With happy thoughts. For a full day. Maybe I have. Without knowing it. I hope so. But hey. I intend to put my curiosity to an actual test. Maybe on Christmas Day. Tell me, folks, is it common to get through a solid day without a single negative thought? Or are we doomed to gloom? --Jim Broede