The sun was shining today. I'm not hungry or cold. My family loves me and God loves me. Money isn't a pressing issue at this very moment. Why then am I sad?
I didn't sleep well last night, (Wasn't it General George Patton that said, "Fatigue makes cowards of us all?") but I don't think that is the problem. Usually periods like this call me to prayer and praise, but I have spent many minutes (hours) in prayer, and I still feel low.
Perhaps it is the human condition itself that leads to sadness. Contrasts heighten awareness. A gloomy day lends extra brightness to the sunny day that follows. A painfree morning may be accepted with little gratitude unless it happens to follow a night of arthritic aches.
None of the above.
I am sad because one of my children is sad.