Some will question how virtue can be acquired by habit because to acquire the virtue a person will already need to act virtuously in order to become habituated to it. Yet to act virtuously and to be virtuous are different things. Virtues and vices are not feelings. 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.