the Philosopher says
(Ethic. vii, 6) that "anger, as if it had drawn the inference that it
ought to quarrel with such a person, is therefore immediately
exasperated." Now to compare and to draw an inference is an act of
reason. Therefore anger, in a fashion, requires an act of reason.

Reply Obj. 1: The movement of the appetitive power may follow an act
of reason in two ways. In the first way, it follows the reason in so
far as the reason commands: and thus the will follows reason,
wherefore it is called the rational appetite. In another way, it
follows reason in so far as the reason denounces, and thus anger
follows reason. For the Philosopher says (De Problem. xxviii, 3) that
"anger follows reason, not in obedience to reason's command, but as a
result of reason's denouncing the injury." Because the sensitive
appetite is subject to the reason, not immediately but through the
will.

Reply Obj. 2: Dumb animals have a natural instinct imparted to them
by the Divine Reason, in virtue of which they are gifted with
movements, both internal and external, like unto rational movements,
as stated above (Q. 40, A. 3).

Reply Obj. 3: As stated in _Ethic._ vii, 6, "anger listens somewhat
to reason" in so far as reason denounces the injury inflicted, "but
listens not perfectly," because it does not observe the rule of
reason as to the measure of vengeance. Anger, therefore, requires an
act of reason; and yet proves a hindrance to reason. Wherefore the
Philosopher says (De Problem. iii, 2, 27) that whose who are very
drunk, so as to be incapable of the use of reason, do not get angry:
but those who are slightly drunk, do get angry, through being still
able, though hampered, to form a judgment of reason.
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FIFTH ARTICLE [I-II, Q. 46, Art. 5]

Whether Anger Is More Natural Than Desire?

Objection 1: It would seem that anger is not more natural than
desire. Because it is proper to man to be by nature a gentle animal.
But "gentleness is contrary to anger," as the Philosopher states
(Rhet. ii, 3). Therefore anger is no more natural than desire, in
fact it seems to be altogether unnatural to man.

Obj. 2: Further, reason is contrasted with nature: since those things
that act according to reason, are not said to act according to
nature. Now "anger requires an act of reason, but desire does not,"
as stated in _Ethic._ vii, 6. Therefore desire is more natural than
anger.

Obj. 3: Further, anger is a craving