I answer that, The passion of anger is peculiar in this, that it cannot have a contrary, either according to approach and withdrawal, or according to the contrariety of good and evil. For anger is caused by a difficult evil already present: and when such an evil is present, the appetite must needs either succumb, so that it does not go beyond the limits of sadness, which is a concupiscible passion; or else it has a movement of attack on the hurtful evil, which movement is that of anger. But it cannot have a movement of withdrawal: because the evil is supposed to be already present or past. Thus no passion is contrary to anger according to contrariety of approach and withdrawal.
In like manner neither can there be according to contrariety of good and evil. Because the opposite of present evil is good obtained, which can be no longer have the aspect of arduousness or difficulty. Nor, when once good is obtained, does there remain any other movement, except the appetite's repose in the good obtained; which repose belongs to joy, which is a passion of the concupiscible faculty.
Accordingly no movement of the soul can be contrary to the movement of anger, and nothing else than cessation from its movement is contrary thereto; thus the Philosopher says (Rhet. ii, 3) that "calm is contrary to anger," by opposition not of contrariety but of negation or privation.
From what has been said the replies to the objections are evident. ________________________
FOURTH ARTICLE [I-II, Q. 23, Art. 4]
Whether in the Same Power, There Are Any Passions, Specifically
Different, but Not Contrary to One Another?
Objection 1: It would seem that there cannot be, in the same power, specifically different passions that are not contrary to one another. For the passions of the soul differ according to their objects. Now the objects of the soul's passions are good and evil; and on this distinction is based the contrariety of the passions. Therefore no passions of the same power, that are not contrary to one another, differ specifically.
Obj. 2: Further, difference of species implies a difference of form. But every difference of form is in respect of some contrariety, as stated in Metaph. x, 8. Therefore passions of the same power, that are not contrary to one another, do not differ specifically.
Obj. 3: Further, since every passion of the soul consists in approach or withdrawal in respect of good or evil, it seems that every difference in the passions of the soul must needs arise from the difference of good and evil; or from the difference of approach and withdrawal; or from degrees in approach or withdrawal. Now the first two differences cause contrariety in the passions of the soul, as stated above (A. 2): whereas the third difference does not diversify the species; else the species of the soul's passions would be infinite. Therefore it is not possible for passions of the same power to differ in species, without being contrary to one another.
On the contrary, Love and joy differ in species, and are in the concupiscible power; and yet they are not contrary to one another; rather, in fact, one causes the other. Therefore in the same power there are passions that differ in species without being contrary to one another.