What does the word exogenous mean in this passage from thireaus walden?

In Thoreau's "Walden," the term "exogenous" refers to influences or factors that originate from outside an individual or system. It emphasizes the idea that external forces, such as societal expectations or material possessions, can impact one's life and decisions. Thoreau advocates for self-reliance and introspection, suggesting that true fulfillment comes from within rather than from external sources.