“The trick — and it’s imperfect and can take a while, but — is simply to write something else.  Don’t let your hands go cold.  Don’t let yourself stop thinking.  Shift to something different.  I think it was Robert Silverberg who used to do his (type)written correspondence on bad days, and then “trick” himself into writing by slipping manuscript paper into the machine once his fingers were flying…”

Click the title for a link to the rest of the piece

I was about to post this myself, when I saw that Kadrey had beaten me to it. 

An idea is not a series, and jokes are not characters […] A story is only a story if (a) it’s about someone (singular or plural) who wants something and (b) something’s in hi (or their) way. And it’s a story worth telling only if (c) the reader has reasons to care about (a) and (b).
Mark Waid, on the creation of INSUFFERABLE (and also giving some print-this-out-and-hang-it-on-the-wall-where-you-work advice for writers.)