From card no. WE7XTUI:

BETTER TO KEEP YOUR MOUTH SHUT AND HAVE PEOPLE THINK YOU A FOOL THAN TO OPEN IT AND REMOVE ALL DOUBT... -E. Hemingway
BETTER TO KEEP YOUR MOUTH SHUT AND HAVE PEOPLE THINK YOU A FOOL THAN TO OPEN IT AND REMOVE ALL DOUBT... -E. Hemingway (or Mark Twain -- whatever)