… is from page 275 of the 1992 collection of some of William Graham Sumner’s best essays, On Liberty, Society, and Politics (Roger C. Bannister, ed.); specifically, this quotation is from Sumner’s profound 1898 essay “The Conquest of the United States by Spain“:
There is no doubt that moral courage is the virtue which is more needed than any other in the modern democratic state, and that truckling to popularity is the worst political vice.
