When people stop believing in an afterlife, everything depends on making the most of this life. And when people start believing in progress – in the idea that history is headed toward an ever more perfect future – they feel far more acutely the pain of their own little lifespan, which condemns them to missing out on almost all of that future. And so they try to quell their anxieties by cramming their lives with experience.

Oliver Burkeman, Four Thousand Weeks: Time and How to Use it