The quote from Sir Arthur Conan Doyle’s "The Valley of Fear" reflects on the cyclical nature of life and human experiences. It suggests that events and circumstances often repeat themselves, akin to a wheel where each spoke brings familiar challenges and situations back around. This notion points to the idea that history tends to repeat itself, making us aware of patterns that persist over time.

By acknowledging that "everything comes in circles," the quote encourages us to observe the past to understand the present and anticipate the future. It implies that while circumstances may seem novel, they often echo previous occurrences, inviting reflection on what has already been experienced. This cyclical perspective serves as a reminder to learn from the past to navigate life's complexities more effectively.