用英语简单写出梭罗瓦尔登湖的主题以及作家的文学理论

The main theme of Thoreau's Walden Lake is the importance of simplifying one's life and living in harmony with nature. Thoreau believed that modern society had become too complex and materialistic, and that individuals needed to reconnect with the natural world in order to find true fulfillment and happiness.

Thoreau's literary theory emphasized the importance of personal experience and observation in writing. He believed that writers should draw inspiration from their own lives and surroundings, rather than relying on established conventions or literary traditions. Thoreau also emphasized the importance of clear and concise language, arguing that excessive ornamentation and abstraction could obscure the true meaning of a work