We might add that Winston Churchill, despite his famous advice to those Harrow schoolboys, was in fact one of history’s greatest quitters. Soon after entering politics he quit one party for another, and later he quit government altogether. When he rejoined, he quit parties again. And when he wasn’t quitting, he was getting tossed out. He spent years in the political wilderness, denouncing Britain’s appeasement of the Nazis, and was returned to office only when that policy’s failure had led to total war. Even in the bleakest moments, Churchill did not back down one inch from Hitler; he became “the greatest of all Britain’s war leaders,” as the historian John Keegan put it. Perhaps it was that long streak of quitting that helped Churchill build the fortitude to tough it out when it was truly necessary. By now, he knew what was worth letting go, and what was not.