Definition: Virtue is the origin of union of goodness, greatness, etc. in one good, great etc. substantial being.
Distinctions and clarification: Virtue is a principle that initiates its own action, so that its existence and action be more virtuous and so that virtue and virtuous beings be more within the natural essence of goodness etc. Hence, supreme virtue is the one which initiates its own action as a substantial being, and by reason of virtue, this initiating substantial being is above any virtue that initiates its act not as a substantial being, but as a part of one, given that the lesser substantial being comprises several different essences and natures in one number. On account of this diversity, active virtue can fail and vice can exist in the subject of virtue on account of the time, quantity and other accidents in which this virtue exists.
Nature: The inherent correlatives of virtue are: active virtue, passive virtue and the act of virtue, which are one essence full of virtue and unity, and in major unity, the habit is more intense and powerful than in dispersion.
Without virtue, everything would be feeble, as all would convert into impossibility and non being.
Virtue, as a principle of this Art, allows the artist to know the conditions of virtue and to know his own virtue in what he is and does on his own; this knowledge promptly enables his intellect to acquire and discover the virtue of its object and to gauge its truth by its virtue because truth and virtue are convertible. Now, as virtue arises substantially from the conjunction of goodness, greatness, etc. it also arises accidentally from the conjunction of the goodness, greatness, duration, etc. that constitute conceptual understanding of morality, and through this virtue the artist apprehends the moral nature of the objects he desires.