They are not acquired without deliberate choice. Neither are they powers, because we possess powers by nature. Virtues are habits. Virtue is what makes a thing perform its function well, so the virtue of a man is the habit from which he becomes good. Virtue is a mean between two extremes, and the specific mean will depend on the person.
Ethical virtue is concerned with feelings and actions.
It is necessary to have the right feelings at the right times for the right things and for the right purposes. A person can err by going toward either excess or deficiency. Some actions or feelings are simply bad, such as maliciousness, envy, adultery, theft and murder. Actions deal with particulars, so it necessary to consider the virtues specifically. The mean between fear and rashness is bravery.