I said it was by Clarence Darrow, but my sister-in-law just informed me that it has been winging its way around Facebook as being by Mark Twain.
A Google search was inconclusive. Mark Twain is alleged to have said all kinds of witticisms that he never really said. Likewise, if Mark Twain isn't cited it is often Samuel Johnson or Yogi Berra. But as Yogi once said himself (or did he?), “I didn't really say everything I said.”
So who said it?

