As he watched the mushroom cloud form at the first atomic-bomb test in July 1945, physicist J. Robert Oppenheimer recalled a line from the Bhagavad Gita: “Now I am become Death, the destroyer of worlds.”

A character in Stendhal’s The Red and the Black, which is set in the run-up to the July Revolution in France, says at one point, “Politics…is a stone tied round the neck of literature which submerges it in less than six months. Politics in the midst of imaginative matter is like a pistol shot in the middle of a concert. The noise is racking without being energetic. It does not harmonize with the sound of any instrument.”