A good many young writers make the mistake of enclosing a stamped, self-addressed envelope, big enough for the manuscript to come back in. This is too much of a temptation for the editor.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- Ring Lardner, (Mar 3 1885-1933), US humorist, journalist, short-story writer; He was known for social satire using American vernacular speech, Treat 'Em Rough, 1918.