Full Idea
We need phronesis (practical wisdom) to coordinate the various virtues into a single line of action or line of thought leading up to an act or to a belief.
Gist of Idea
We need phronesis to coordinate our virtues
Source
Linda Trinkaus Zagzebski (Virtues of the Mind [1996], II 5.2)
Book Reference
Zagzebski,Linda: 'Virtues of the Mind' [CUP 1996], p.224
A Reaction
If I have a conflicting virtue and vice in a single situation, something must make sure that the virtue dominates. That sounds more like Kant's 'good will' than like phronesis.