Even if you walk exactly the same route each time - as with a sonnet - the events along the route cannot be imagined to be the same from day to day, as the poet's health, sight, his anticipations, moods, fears, thoughts cannot be the same.

Summary

This quote suggests that even if you follow the same path every day, the experiences and events that occur along the way will always differ. This comparison to a sonnet, a fixed poetic form, highlights how the changing variables within a person, such as their health, sight, thoughts, and emotions, make every day unique and distinct. It emphasizes the inherent unpredictability and diversity of life, even in seemingly familiar situations.