This quote is a metaphorical assertion about the depth and reach of Thoreau’s seminal work, "Walden". The idea of Walden reaching "quite through to the other side of the globe" suggests that the insights and lessons offered in the book have universal resonance and applicability, transcending geographical, cultural, and temporal boundaries. The "other side of the globe" is a metaphor for different perspectives, cultures, and ways of life. The quote implies that the wisdom contained in "Walden" is not limited to Thoreau’s context but can be understood and appreciated by people from all walks of life.

The book "Walden" chronicles Thoreau’s experiences living in simple conditions, away from societal norms and expectations. It is a meditation on the importance of solitude, self-reliance, simplicity, and a close relationship with nature. These themes have universal appeal and relevance, hence the idea of Walden reaching the other side of the globe.

In today’s world, where people are increasingly disconnected from nature and often overwhelmed by societal pressures and materialistic pursuits, the teachings of "Walden" are arguably more relevant than ever. The idea of simplifying one’s life, seeking solitude, and forming a close relationship with nature can be a powerful antidote to the stress, burnout, and dissatisfaction that many people experience in modern society.

In terms of personal development, Thoreau’s philosophy encourages introspection, simplicity, and self-reliance. It suggests that happiness and fulfillment come not from external possessions or achievements but from a deep connection with oneself and the natural world. This idea can be applied in personal development by encouraging individuals to simplify their lives, prioritize their mental and emotional well-being, and seek fulfillment in their relationship with nature and their inner selves.