In Ian McEwan's novel "Atonement," the quote emphasizes the fragility of human beings, highlighting that while we possess depth and complexity, we are ultimately vulnerable and subject to emotional and physical harm. This notion illustrates how easily a person can suffer pain and heartbreak, suggesting that our material existence makes us susceptible to life's challenges.

The quote also implies that once a person is damaged, it can be incredibly difficult to heal fully. The idea of being "easily torn" and "not easily mended" speaks to the lasting impacts of trauma and the struggle for restoration. Through the lens of the book, McEwan delves into themes of guilt, redemption, and the intricate layers of human relationships, ultimately conveying the message that while we are resilient, the scars we bear shape our identities.