Why are you so sad?

Why are so many Christians so sad? Why are so few Christians happy? Why is there such an epidemic of depression among Christian? Can anything be done to improve the situation

1. The sad soul
   a. Pictures of a sad soul
   b. The causes of a sad soul
   c. The marks of a sad soul

2. The smiling soul
   a. Hope in the same God
   b. Hope in the sovereign God
   c. Hope in the saving God
   d. Hope in the sympathetic God