In John Updike's book "Bech: A Book," the author explores the theme of reality versus potential. He suggests that as we engage with the world, we often lose out on the endless possibilities that life offers. This notion highlights how each moment we experience reduces the array of choices available to us, leading to a sense of loss or impoverishment. The statement reflects the idea that while we are constantly moving forward, we leave behind the dreams and opportunities that remain unfulfilled.

Through this lens, Updike encourages readers to contemplate the tension between what is and what could have been. The quote resonates with the idea that our actions and decisions shape our reality, often at the expense of potential experiences. It serves as a poignant reminder to appreciate the possibilities that life presents, even as we navigate the constraints of our actual experiences.