"Avirtue is a habitual and firm disposition to do the good. It allows the person not only to perform good acts, but to give the best of himself. The virtuous person tends toward the good with all his sensory and spiritual powers; he pursues the good and chooses it in concrete actions" (Catechism of the Catholic Church, 1803).
Or, as St. Gregory of Nyssa said, the goal of a virtuous life is to become like God.
