We must distinguish the virtues you would need even on a desert island from the virtues you need only among other men. Justice is clearly social. Independence is hard to call. We can recognize justice and honesty as sub-methods of diplomacy. To treat men justly and honestly is essential to winning and keeping their help.
Diplomacy is the art of getting others to help.
Rather, the aim of your diplomacy is your own good. Whatever friendships, alliances or arrangements you come to with others, can only be based on your own knowledge and purposes. Independence puts your diplomacy at the service of your own life. It deserves your focus and your thought. I seek help to learn more about diplomacy.