Bad run > no run. I have to remember this, getting up and doing SOMETHING is better than doing nothing! That's why I ran this morning even though it was the last thing I wanted to do, and I felt AMAZING afterwards!
I'm only responsible for what I say, not for what you understand. Although as an author I am responsible for making readers understand--a reader who doesn't understand is an unhappy reader. (And there is some value to leaving some questions unanswered.