Politics, Aristotle wrote in the Nicomachean Ethics, is the “master science of the good.” The good of which he wrote is the greater good, the “highest good” that benefits the state, not the personal.
For even if the good is the same for the individual and the state, the good of the state clearly is the greater and more perfect thing to attain and safeguard. the attainment of the good for one man alone is, to be sure, a source of satisfaction; yet to secure it for a nation and for states is nobler and more divine.
But good is hard to define, Aristotle wrote, and full of “irregularity” because, he added, “in many cases good things bring harmful results.”
For Aristotle and his fellow philosophers, politics was the science of figuring out what is conducive to life in a polis or city (which in the Greece of his day were city states); it determined how people can live together in communities and cities. It still is, which is why his 2,000-plus year-old work, Politics, is still taught in poli-sci courses.
Politics also has the practical side: the legislative component. And ethics underlies both parts.
Ethics and virtue are interconnected in Aristotle, but it’s not entirely the same virtue of which Machiavelli writes (and Aristotle described many more virtues than Plato’s four: courage, wisdom, temperance and justice). Aristotle’s virtue is a mean between excess and deficiency. It isn’t being super good, or unbendingly upright, or sticking to a dogma or theological script.
Situation ethics teaches that ethical decisions should follow flexible guidelines rather than absolute rules, and be taken on a case by case basis.
As this site notes:
Aristotle says that it is a mean between extremes, but not a mechanically determinable mean: “to feel them at the right times, with reference to the right objects, towards the right people, with the right motive, and in the right way”
For example, the mean between obsequiousness and cantankerousness is friendliness (see here). Angry, vituperative blogs full of accusation and wild allegation would not fit Aristotle’s definition of virtuous because they have a deficiency of social conduct, according to the chart.
As this site explains:
The good for human beings, then, must essentially involve the entire proper function of human life as a whole, and this must be an activity of the soul that expresses genuine virtue or excellence.
It also notes:
True happiness can therefore be attained only through the cultivation of the virtues that make a human life complete.
Cultivation: it means virtues have to be consciously worked at, and practiced. They are not innate or hereditary.