used from sin altogether, unless it be rendered altogether
involuntary. Consequently, if the passion be such that it renders the
subsequent act wholly involuntary, it entirely excuses from sin;
otherwise, it does not excuse entirely. In this matter two points
apparently should be observed: first, that a thing may be voluntary
either _in itself,_ as when the will tends towards it directly; or
_in its cause,_ when the will tends towards that cause and not
towards the effect; as is the case with one who wilfully gets drunk,
for in that case he is considered to do voluntarily whatever he does
through being drunk. Secondly, we must observe that a thing is said
to be voluntary "directly" or "indirectly"; directly, if the will
tends towards it; indirectly, if the will could have prevented it,
but did not.

Accordingly therefore we must make a distinction: because a passion
is sometimes so strong as to take away the use of reason altogether,
as in the case of those who are mad through love or anger; and then
if such a passion were voluntary from the beginning, the act is
reckoned a sin, because it is voluntary in its cause, as we have
stated with regard to drunkenness. If, however, the cause be not
voluntary but natural, for instance, if anyone through sickness or
some such cause fall into such a passion as deprives him of the use
of reason, his act is rendered wholly involuntary, and he is entirely
excused from sin. Sometimes, however, the passion is not such as to
take away the use of reason altogether; and then reason can drive the
passion away, by turning to other thoughts, or it can prevent it from
having its full effect; since the members are not put to work, except
by the consent of reason, as stated above (Q. 17, A. 9): wherefore
such a passion does not excuse from sin altogether.

Reply Obj. 1: The words, "So that you do not the things that you
would" are not to be referred to outward deeds, but to the inner
movement of concupiscence; for a man would wish never to desire evil,
in which sense we are to understand the words of Rom. 7:19: "The evil
which I will not, that I do." Or again they may be referred to the
will as preceding the passion, as is the case with the incontinent,
who act counter to their resolution on account of their concupiscence.

Reply Obj. 2: The particular ignorance which excuses altogether, is
ignorance of a circumstance, which a man is unable to know even after
taking due precautions. But pass