Help with Egotism

I vaguely remember a quotation, probably from my creative writing theory class at BYU and possibly from The Fourth Genre (though a scan of the book did not produce the desired quotation), to the effect that it takes a special sort of egotist to write memoir/personal essay--the idea being that you have to assume that people would be interested in reading about you. Does this ring a bell (speaking to editorgirl specifically but to the world generally)?