In part, art completes what nature cannot elaborate; and in part it imitates nature.

Youth is easily deceived because it is quick to hope.

The virtue of justice consists in moderation, as regulated by wisdom.

.. for desire is like a wild beast, and anger perverts rulers and the very best of men. Hence law is intelligence without appetition.

[Prudence] is the virtue of that part of the intellect [the calculative] to which it belongs; and . . . our choice of actions will not be right without Prudence any more than without Moral Virtue, since, while Moral Virtue enables us to achieve the end, Prudence makes us adopt the right means to the end.

Pleasure causes us to do base actions and pain causes us to abstain from doing noble actions.

The virtue of the good man is necessarily the same as the virtue of the citizen of the perfect state.