Full Idea
A pure virtue theory can have as many rules as you like as long as they are understood as grounded in the virtuous motivations and understanding of the nonmoral facts that virtuous agents possess.
Gist of Idea
Virtue theory can have lots of rules, as long as they are grounded in virtues and in facts
Source
Linda Trinkaus Zagzebski (Virtues of the Mind [1996], II 6.1)
Book Reference
Zagzebski,Linda: 'Virtues of the Mind' [CUP 1996], p.238
A Reaction
It is important, I think, to see that a virtue theorist does not have to be a particularist.