I was minding my own business and overheard some random stranger saying "I could write a book." I wasn't paying much attention, but I'm pretty sure it was about relationships, which made me laugh. (Doesn't everybody think they have it figured out?)
I felt nothing but contempt for this person. Oh yeah? You could write a book? Well do it or shut up. I don't care what you could do. Nobody does. If you feel compelled to talk about your abilities to write, why not try feeling compelled to actually do some writing?
Several years ago, I said that "If you have an ability that you do not use, you may as well not have it." I am saying it again tonight, because I still believe it to be true.