“Pessimistic people are happier.
Think about it. Optimistic people are only happy when things go the way they expect.
Ergo - I think it will be good — it is good, therefore this affirms my disposition; therefore I am happy.
If things go bad, things go against my disposition and I feel bad about”
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Your scenario recalls a scene in “What about Bob,” if I recall correctly. I forget which character but I want to say it was the son.
“Don’t expect friends, don’t expect fun, don’t expect a good life, don’t expect anything and if you get something, it’s a bonus.” - Frank Zappa
(Of course Frank only made it to 53, so perhaps the theory isn’t so true)