The quote refers to the challenging nature of the path toward truth and enlightenment, likening it to a thin, sharp edge that is difficult to navigate. This metaphor suggests that the journey requires careful consideration and discipline, emphasizing the complexities involved in understanding deeper spiritual or philosophical truths. The notion of poets declaring this difficulty underscores the age-old recognition of the struggles faced by those striving for wisdom.

In the context of Huston Smith's "The World's Religions," this idea resonates with the various religious paths and traditions explored in the book. Each path offers its own set of challenges and insights, highlighting the richness of human belief and experience. Smith's work invites readers to appreciate the nuances of different faiths while acknowledging that the pursuit of understanding can often be fraught with obstacles.