" Not that he [Uzbek] rejected Mendel's proposals or rebelled against his decisions; but he exercised a subtle, passive abrasion against every active thrust: like dust in a watch, Mendel thought to himself. He's got dust in him, even though he is young. It's stupid to say the young are strong. You understand many things better at thirty than at twenty and you can also bear them better. "

― Primo Levi , If Not Now, When?