A vigorous five-mile walk will do more good for an unhappy but otherwise healthy adult than all the medicine and psychology in the world.

Summary

This quote suggests that physical activity, specifically a vigorous five-mile walk, has the ability to bring more benefits to an unhappy individual who is generally in good health than any medications or psychological interventions. It implies that exercise can have a profound impact on improving one's mood and overall well-being, surpassing the possible healing effects and therapeutic approaches that medicine and psychology can offer. In essence, the quote highlights the transformative power of physical activity on mental health.