Final answer:
The passage from 'The Tale of Genji' highlights the central idea of love enduring despite societal challenges and adversity, with the emperor's unwavering love for a lady of intermediate rank.
Step-by-step explanation:
One of the central ideas from the passage adapted from The Tale of Genji is that love can persevere in the face of adversity and societal pressures. In this narrative, the emperor's love for a lady of neither high nor low rank illustrates the theme of love triumphing over social constraints and malicious gossip. Despite the woman becoming ill due to the court's unkindness, which forced her to stay away from the court, the emperor's determination and affection for her only intensified, showing the power of love to overcome challenges and the courage it can inspire.