The mood is your own personal weather.
If you go outside, and it’s raining – it’s not you who’ve made it rain, it has rained, and it is real.
You can’t unthink the rain. You can’t say ”Well I’ll walk it off and then it will be sunny”. The weather makes up its own mind.
And the two mistakes are either to deny that it’s raining, when it clearly is.
And the other thing is to say ”Therefore my life is over, it’s raining and the sun will never come out, that’s it”.