Reply Obj. 2: Just as in the natural order the same principle causes movement from one extreme and movement towards the other; and as in the intellectual order contraries have one common ratio; so too between contrary passions there is but one moral virtue, which, like a second nature, consents to reason's dictates.
Reply Obj. 3: Those three passions are directed to the same object in a certain order, as stated above: and so they belong to the same virtue. ________________________
FIFTH ARTICLE [I-II, Q. 60, Art. 5]
Whether the Moral Virtues Differ in Point of the Various Objects of the Passions?
Objection 1: It would seem that the moral virtues do not differ according to the objects of the passions. For just as there are objects of passions, so are there objects of operations. Now those moral virtues that are about operations, do not differ according to the objects of those operations: for the buying and selling either of a house or of a horse belong to the one same virtue of justice. Therefore neither do those moral virtues that are about passions differ according to the objects of those passions.
Obj. 2: Further, the passions are acts or movements of the sensitive appetite. Now it needs a greater difference to differentiate habits than acts. Hence diverse objects which do not diversify the species of passions, do not diversify the species of moral virtue: so that there is but one moral virtue about all objects of pleasure, and the same applies to the other passions.
Obj. 3: Further, more or less do not change a species. Now various objects of pleasure differ only by reason of being more or less pleasurable. Therefore all objects of pleasure belong to one species of virtue: and for the same reason so do all fearful objects, and the same applies to others. Therefore moral virtue is not diversified according to the objects of the passions.
Obj. 4: Further, virtue hinders evil, even as it produces good. But there are various virtues about the desires for good things: thus temperance is about desires for the pleasure of touch, and eutrapelia about pleasures in games. Therefore there should be different virtues about fears of evils.
On the contrary, Chastity is about sexual pleasures, abstinence about pleasures of the table, and eutrapelia about pleasures in games.
I answer that, The perfection of a virtue depends on the reason; whereas the perfection of a passion depends on the sensitive appetite. Consequently virtues must needs be differentiated according to their relation to reason, but the passions according to their relation to the appetite. Hence the objects of the passions, according as they are variously related to the sensitive appetite, cause the different species of passions: while, according as they are related to reason, they cause the different species of virtues. Now the movement of reason is not the same as that of the sensitive appetite. Wherefore nothing hinders a difference of objects from causing diversity of passions, without causing diversity of virtues, as when one virtue is about several passions, as stated above (A. 4); and again, a difference of objects from causing different virtues, without causing a difference of passions, since several virtues are directed about one passion, e.g. pleasure.