From Bartlett's Book of Anecdotes:
Hemingway and William Faulkner did not have a very high opinion of each other. Faulkner said of Hemingway that he had no courage, that "he had never been known to use a word that might send the reader to the dictionary." When Hemingway heard this, he said:
Poor Faulkner. Does he really think big emotions come from big words? He thinks I don't know the ten-dollar words. I know them all right. But there are older and simpler and better words, and those are the ones I use.