Virtue is a stable "state" of character that allows a person to choose the right action consistently.
To be morally responsible, a person must act voluntarily and be aware of what they are doing. The Doctrine of the Golden Mean Aristotle's Nicomachean Ethics
We become just by performing just acts and brave by performing brave acts. Virtue is a stable "state" of character that
True happiness is not a temporary emotion but a state achieved over a complete life. The Nature of Virtue (Arete) Aristotle's Nicomachean Ethics