In an unpublished 1966 lecture on the centennial of Aby Warburg’s birth, Max Adolph, Aby’s only son and at one time his designated successor as director of the Warburg Library, remarked that his father had embodied like no other the virtue Chancellor Bismarck sorely missed in his fellow citizens, namely, Zivilcourage: “Had there been more Germans like this German Jew, we might have been spared the horrors of Nazism and our second war.” The chief...