In this short story by F. Scott Fitzgerald there is a sentence:
It was like in the beginning fifteen years ago when they said he had "fatal facility", and he labored like a slave over every sentence so as not to be like that.
I also found this phrase in some old magazine.
I think "facility" in these cases means "inborn ability" or "fluenty at something". And it's "fatal" for some reason. But what does it mean as a whole?