ion causes ignorance of law in a
particular case, by preventing universal knowledge from being applied
to a particular act, which passion the reason is able to drive away,
as stated.

Reply Obj. 3: Bodily disease is involuntary: there would be a
comparison, however, if it were voluntary, as we have stated about
drunkenness, which is a kind of bodily disease.
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EIGHTH ARTICLE [I-II, Q. 77, Art. 8]

Whether a Sin Committed Through Passion Can Be Mortal?

Objection 1: It would seem that sin committed through passion cannot
be mortal. Because venial sin is condivided with mortal sin. Now sin
committed from weakness is venial, since it has in itself a motive
for pardon (_venia_). Since therefore sin committed through passion
is a sin of weakness, it seems that it cannot be mortal.

Obj. 2: Further, the cause is more powerful than its effect. But
passion cannot be a mortal sin, for there is no mortal sin in the
sensuality, as stated above (Q. 74, A. 4). Therefore a sin committed
through passion cannot be mortal.

Obj. 3: Further, passion is a hindrance to reason, as explained above
(AA. 1, 2). Now it belongs to the reason to turn to God, or to turn
away from Him, which is the essence of a mortal sin. Therefore a sin
committed through passion cannot be mortal.

_On the contrary,_ The Apostle says (Rom. 7:5) that "the passions of
the sins . . . work [Vulg.: 'did work'] in our members to bring forth
fruit unto death." Now it is proper to mortal sin to bring forth
fruit unto death. Therefore sin committed through passion may be
mortal.

_I answer that,_ Mortal sin, as stated above (Q. 72, A. 5), consists
in turning away from our last end which is God, which aversion
pertains to the deliberating reason, whose function it is also to
direct towards the end. Therefore that which is contrary to the last
end can happen not to be a mortal sin, only when the deliberating
reason is unable to come to the rescue, which is the case in sudden
movements. Now when anyone proceeds from passion to a sinful act, or
to a deliberate consent, this does not happen suddenly: and so the
deliberating reason can come to the rescue here, since it can drive
the passion away, or at least prevent it from having its effect, as
stated above: wherefore if it does not come to the rescue, there is a
mortal sin; and it is thus, as we see, that many murders and
adulteries are committed through passion.

Reply Obj. 1: A sin may be