“Serious drinkers are like serious eaters or serious noneaters. They are like serious drug-addicts. Their addiction holds a spell over them which acts as some powerful secret at the center of everything they do. The serious eater listens to others talking of diets, Weight Watchers, exercises; she hears them excitedly comparing pounds lost, pounds gained. She hears them encouraging each other, joking, consoling. She is not one of them. She knows the diets better than they do; she knows Weight Watchers is useless for her; she knows her life is on some Almighty Scale that she has to step on alone. She is in some covenant with food — a covenant which she probably does not understand, but which nevertheless exerts some magical, compelling power over her. She hates it; she loves it; she keeps her covenant silent.”

Source: The Memory Keeper's Daughter

Sometimes attributed to Heisenberg, this was actually a statement made by Niels Bohr, as quoted in The Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
Some things are so serious that one can only joke about them.
Variant without any citation as to author in Denial is not a river in Egypt (1998) by Sandi Bachom, p. 85
Misattributed

As quoted in The Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
Some things are so serious that one can only joke about them.
Variant without any citation as to author in Denial is not a river in Egypt (1998) by Sandi Bachom, p. 85.

"The Haunted Smile: The Story of Jewish Comedians in America" (2001)

Statement in Detroit, Michigan (10 November 1963).
Attributed

Source: The Glass Castle

The Moviegoer (1961)

Source: Persuasion

interview with Lorin Morgan-Richards by Rose Traul of Columbia College Chicago (22 January 2013).