" Obviously the happy man feels good only because the unhappy bear their burden silently, and without that silence happiness would be impossible. It’s a general hypnosis. At the door of every contented, happy man somebody should stand with a little hammer, constantly tapping, to remind him that unhappy people exist, that however happy he may be, sooner or later life will show him its claws, some calamity will befall him—illness, poverty, loss—and nobody will hear or see, just as he doesn’t hear or see others now. But there is nobody with a little hammer, the happy man lives on, and the petty cares of life stir him only slightly, as wind stirs an aspen—and everything is fine. "

― Anton Chekhov