Time

"We live in time - it holds us and moulds us -  but I've never felt I understood it very well. And I'm not referring to theories about how it bends and doubles back, or may exist elsewhere in parallel versions. No, I mean ordinary, everyday time, which clocks and watches assure us passes regularly: tick-tock, click-clock. Is there anything more plausible than a second hand? And yet it takes only the smallest pleasure or pain to teach us time's malleability. Some emotions speed it up, others slow it down; occasionally, it seems to go missing - until the eventual point when it really does go missing, never to return." 

- The Sense of an Ending, Julian Barnes