Virtue is not something we are born with; it is a developed through practice.
True happiness is not a temporary emotion but a state achieved over a complete life. The Nature of Virtue (Arete) Aristotle's Nicomachean Ethics
To be morally responsible, a person must act voluntarily and be aware of what they are doing. The Doctrine of the Golden Mean Virtue is not something we are born with;
Aristotle’s most practical contribution is the idea that moral virtue is a between two extremes: excess and deficiency . Aristotle's Nicomachean Ethics - Essay Examples - PapersOwl Aristotle's Nicomachean Ethics
Just as a knife is "good" if it cuts well, a human is "good" if they perform their unique function well.
We become just by performing just acts and brave by performing brave acts.