L. Frank Baum,
The Tin Woodman of Oz — Chapter 5…
(1918)
“ Both the Scarecrow and the Tin Woodman tried to think of some way to escape from the castle before morning, but she seemed to read their thoughts and shook her head."Don't worry your poor brains," said she. "You can't escape me, however hard you try. But why should you wish to escape? I shall give you new forms that are much better than the ones you now have. Be contented with your fate, for discontent leads to unhappiness, and unhappiness, in any form, is the greatest evil that can befall you." ”
