Not sure why this was downvoted, s/he asks a valid question. I didn't read the article, but I know that personally some level of negativity is helpful, because

Not sure why this was downvoted, s/he asks a valid question. I didn't read the article, but I know that personally some level of negativity is helpful, because I am very prone to saying "Look, I'm <positive trait/accomplishment>, so I shouldn't worry about not achieving goal X"