In Greek mythology, Cassandra was a prophetess. The power to foretell the future was given to her by Apollo as an expression of his desires... and Cassandra received the gift, promising to comply with his desires. But then she spurned Apollo’s advances, and he sought revenge. He could not rescind her gift of prophecy because the creed of the gods was that divine favors once bestowed could not be revoked. What Apollo did, therefore,...