The same resilience and joie de vivre that helped see Roosevelt and Churchill through difficult illnesses were integral to their success as wartime leaders. Both men were able to draw upon an innate capacity for joy and energy, both found delight in difficult work, and both knew from experience that hardship could be overcome. ...

To meet Roosevelt, said Churchill, "with all his buoyant sparkle, his iridescence," was like "opening a bottle of champagne." Churchill, who knew both champagne and human nature, recognized ebullient leadership when he saw it.

Kay Redfield Jamison, Exuberance