Now one can love the good of a city in two ways: in one way to possess it, in another that it might be preserved. If someone loves the good of a city in order to have and own it, he is not a good political person, because in this way even a tyrant loves the good of a city, in order to dominate it, which is to love oneself more than the city. He wants this good for himself, not for the city.
But to love the good of the city that it might be kept and defended, this is truly to love the city and this makes a person a good political person, so much so that some expose themselves to the danger of death and neglect their private good in order to preserve or increase the good of the city. In the same way, to love the good that is participated by the blessed, to love it so as to have or possess it, does not establish the right relation between a person and blessedness, because even evil people want this good.
But to love that good according to itself, that it may remain and be shared out and that nothing be done against this good, this gives to a person the right relation to that society of the blessed. And this is love [caritas] which loves God for his sake and the neighbors, who are capable of blessedness, as oneself.
-St. Thomas Aquinas, De Virtutibus, 2.2 c.