Write what you know? On second thought …
“Creative writing teachers should be purged until every last instructor who has uttered the words ‘Write what you know’ is confined to a labor camp. Please, talented scribblers, write what you don’t. The blind guy with the funny little harp who composed The Iliad, how much combat do you think he saw?” — P. J. O’Rourke
“It still comes as a shock to realize that I don’t write about what I know; I write in order to find out what I know.” — Patricia Hampl
“Writing what you know ignores the whole purpose of creative writing. Writing is an act of the imagination. Good writing is generally bigger than the writer — if we only write about ‘what you know,’ our work will never be more compelling than we are.” — Willie Davis
See 
Christina Baker Kline: Writing/Life 