Why are you happy when I’m so sad?
It is a trick of the brain when 2 people can be experiencing the same circumstances and one person enjoys themselves while the other does not. Or the same people can participate in a familiar activity and on one occasion
“quit belly-achin’ about what isn’t working”
Isn't it funny how we do this? I also think of 'belly aching' as rumination. Either way, in a modern life these kind of thoughts don't produce any value. Not like a cow, where ruminating makes the bits of food