What separates the truly driven from those merely chasing paychecks is understanding that completion isn't the finish line—it's the gateway. Salk, who spent years in relative obscurity before developing the polio vaccine, knew that excellence doesn't earn you rest; it earns you harder problems. Most people want recognition or money, but notice what he claims as the actual prize: *more work*. Watch a surgeon who saves a difficult life—they don't retire satisfied; they suddenly see ten cases they now feel equipped to tackle, and their hunger sharpens rather than dulls.