I suffer the mortification of seeing myself attacked right and left by people at home professing patriotism and love of country who never heard the whistle of a hostile bullet. I pity them and the nation dependent on such for its existence. I am thankful, however that, though such people make a great noise, the masses are not like them.
Whereas nationalism still seeks power, honour, and glory through means that endanger other countries, patriotism knows that a country's strength and honour can only be permanently safeguarded through concourse with other countries. And whereas nationalism scoffs at the idea of international laws and regulations, patriotism seeks to create such.
My definition, the definition that I've always believed in, is that esprit de corps means love for one's own military legion - in my case, the United States Marine Corps. It means more than self-preservation, religion, or patriotism. I've also learned that this loyalty to one's corps travels both ways: up and down.