From the same essay (It's like it was custom-written!):

"Obsession. As nearly as possible, no nationalist ever thinks, talks, or writes about anything except the superiority of his own power unit. It is difficult if not impossible for any nationalist to conceal his allegiance. The smallest slur upon his own unit, or any implied praise of a rival organization, fills him with uneasiness which he can relieve only by making some sharp retort. If the chosen unit is an actual country, such as Ireland or India, he will generally claim superiority for it not only in military power and political virtue, but in art, literature, sport, structure of the language, the physical beauty of the inhabitants, and perhaps even in climate, scenery and cooking."