In Ian McEwan's "Saturday," the protagonist reflects on the temporary nature of ownership, realizing that material possessions are merely borrowed or rented in the grand scheme of life. This perspective prompts a deeper understanding of the transient relationship humans have with their belongings, emphasizing that these items ultimately belong to the world rather than to individuals.

The main character's insight reveals a universal truth about existence—our possessions may remain long after we are gone. This contemplation suggests that true value lies not in accumulation but in the experiences and connections we form, as everything material is destined to be left behind as we move on from life.