In John Irving's novel "A Prayer for Owen Meany," a significant quote reflects on the fleeting nature of human existence. The line suggests that if humanity's beginnings can be traced back to the Pleistocene epoch, then perhaps our end is just as imminent. This sentiment emphasizes the transient quality of life and poses existential questions about the legacy and longevity of mankind.

The quote resonates with themes of mortality and the search for meaning throughout the narrative. It suggests that despite the vast history of humanity, the time we have may indeed be finite. Through Owen Meany's unique perspective and extraordinary life, the novel explores the complexities of faith, purpose, and the impact one individual can have within the span of a million years of human history.