The text states "no one has unmixed happiness." How does the story of Ratanji serve as an example of this philosophy?

The story of Ratanji in Chapter 14 perfectly illustrates the philosophy that "no one has unmixed happiness." Outwardly, Ratanji was the epitome of success; he was a famous merchant with vast wealth, property, and a reputation for being pleasant and generous. To the world, he was "swimming in an ocean of joy." However, the narrative reveals that this external prosperity was contrasted by a deep inner turmoil. The text describes a "crocodile of a difficult inner worry" that always surrounded him: the fact that he had no son. This single, nagging worry made his worldly happiness feel fruitless and left him in a constant state of unease, demonstrating that even immense fortune cannot guarantee complete happiness.