Final answer:
The phrase in the 'Song of the Yue People' from the 'Book of Songs' metaphorically reflects the state's prosperity and suggests the king's pervasive and positive influence, despite his potential unawareness of the individual happiness of his subjects.
Step-by-step explanation:
Understanding the 'Book of Songs' 'Song of the Yue People'
The line from the Book of Songs, 'Song of the Yue People', that states 'there are trees on the mountains, trees have branches, and the heart is happy to the king, but the king doesn't know', is a metaphor conveying the flourishing state of the kingdom under King Wān's reign. The imagery of the trees and branches is symbolic of the kingdom's prosperity and growth. The poem suggests that the king's influence was pervasive and beneficent, affecting even the natural world, leading to a better-ruled kingdom, with society following suit in improved manners and discipline. While the king may not be aware of each individual's joy, his policies and governance have created an environment where happiness can prosper.
Further highlighting this extended welfare across levels of being, parallels are drawn from Han Feizi who speaks of sage-kings living frugally and working diligently, underscoring the humility and industrious nature expected of just rulers. The reference to Confucius in the Spring and Autumn Annals points to the importance of noble ideals in leadership. The Qingming scroll reflects on a period of economic prosperity reminiscent of the harmony described in the Book of Songs.