Full Idea
Virtues such as justice consist mainly in adherence to rules of conduct, while those such as benevolence we might call virtues of attachment.
Gist of Idea
Some virtues imply rules, and others concern attachment
Source
Philippa Foot (Morality, Action, and Outcome [1985], p.101)
Book Reference
Foot,Philippa: 'Moral Dilemmas' [OUP 2002], p.101
A Reaction
Not sure about 'attachment'. We should be benevolent towards people to whom we are not particularly attached. Courage doesn't fall into either group.