We become just by the practice of just actions, self-controlled by exercising self-control, and courageous by performing acts of courage.

That which is common to the greatest number has the least care bestowed upon it. Every one thinks chiefly of his own, hardly at all of the common interest; and only when he is himself concerned as an individual. For besides other considerations, everybody is more inclined to neglect the duty which he expects another to fulfill.

[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.

We become just by performing just action, temperate by performing temperate actions, brave by performing brave action.

Also, that which is desirable in itself is more desirable than what is desirable per accidens.

Metaphysics is universal and is exclusively concerned with primary substance. ... And here we will have the science to study that which is, both in its essence and in the properties which it has.

Republics decline into democracies and democracies degenerate into despotisms.