This is the advice given when someone is trying to start a new habit: Never Miss Twice.
It's true, we all have those moments when we trash the diet, blow the budget, or forget to write a blog post. One skip/expenditure/doughnut really is no big deal. It is the second fail that really messes with you. Because you start to think things like, "What does it really matter, I've already missed two days of writing, what's one more?"
And then two becomes three and three becomes a week and pretty soon … you just quit. (Sorry, faithful readers; I have been derailed and discouraged and just let the blog lapse for a while).
I think this is good advice (and I'm sorry I can't even credit the originator of it because I don't remember who said it) -
Never miss twice.
I'm working on it.