This book contains the following story:

The Fox and the Grapes
One hot summers day a Fox was walking through an orchard when he spotted a bunch of juicy grapes just out of reach. Yum, thought Fox. Those grapes would be great to quench my thirst. Fox took a running jump but missed the grapes. He tried again and again but could not reach the grapes. Eventually he gave up and told himself that this was no loss anyhow as the grapes would probably have been sour anyway. Moral: it is easy to despise what you cannot get.