... you have to have been desperately unhappy before you can play comedy, so that nothing can frighten you any more. And you can't do tragedy before you know absolute happiness, because having known that, you are safe.
Dame Edith Evans (1888–1976), British actor. As quoted in Dame Edith Evans, ch. 12, by Bryan Forbes (1977).
A brilliantly successful actress, Evans identified both her "desperate unhappiness" and her "absolute happiness" with her husband, George "Guy" Booth, with whom she had fallen in love in 1904; he died in 1935.