Prudence - Article 11

Article 11. Whether prudence about one's own good is specifically the same as that which extends to the common good?

"Political prudence," which is directed to the common good of the state, "domestic economy" which is of such things as relate to the common good of the household or family, and "monastic economy" which is concerned with things affecting the good of one person, are all distinct sciences. Therefore in like manner there are different kinds of prudence, corresponding to the above differences of matter.

I answer that, As stated above (5; 54, 2, ad 1), the species of habits differ according to the difference of object considered in its formal aspect. Now the formal aspect of all things directed to the end, is taken from the end itself, as shown above (I-II, Prolog.; I-II, 102, 1), wherefore the species of habits differ by their relation to different ends. Again the individual good, the good of the family, and the good of the city and kingdom are different ends. Wherefore there must needs be different species of prudence corresponding to these different ends, so that one is "prudence" simply so called, which is directed to one's own good; another, "domestic prudence" which is directed to the common good of the home; and a third, "political prudence," which is directed to the common good of the state or kingdom.

http://www.newadvent.org/summa/3047.htm#article11