The term HE WROTE ABOUT 'SOUR GRAPES' is referring to the ancient Greek storyteller AESOP. AESOP is best known for his fables, which are stories that teach moral lessons. One of his most famous fables is 'The Fox and the Grapes, ' in which a fox tries to reach some grapes that are too high for him to reach. After failing to get the grapes, he decides they must have been sour anyway and walks away, saying 'Sour grapes!' This phrase has become a popular idiom meaning 'to be envious of something you cannot have.'