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frogman80
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From Summa Theoloica:
newadvent.org/summa/306606.htm
newadvent.org/summa/306600.htm
newadvent.org/summa/306606.htm
Objection (false objection):
It would seem that theft is not a mortal sin. For it is written (Prov. vi. 30): “The fault is not so great when a man hath stolen.” But every mortal sin is a great fault. Therefore theft is not a mortal sin.
Reply (Aquinas’ reply):
The statement that theft is not a great fault is in view of two cases. First, when a person is led to thieve through necessity. This necessity diminishes or entirely removes sin, as we shall show further on (II-II:66:7). Hence the text continues: “For he stealeth to fill his hungry soul.” Secondly, theft is stated not to be a great fault in comparison with the guilt of adultery, which is punished with death. Hence the text goes on to say of the thief that “if he be taken, he shall restore sevenfold . . . but he that is an adulterer . . . shall destroy his own soul.”
Objection (false objection):
Further, theft can be committed in small even as in great things. But it seems unreasonable for a man to be punished with eternal death for the theft of a small thing such as a needle or a quill. Therefore theft is not a mortal sin.
Aquinas wrote quite a bit on theft… you can read the various articles here:Reply (Aquinas’ reply):
Reason accounts as nothing that which is little: so that a man does not consider himself injured in very little matters: and the person who takes such things can presume that this is not against the will of the owner. And if a person take such like very little things, he may be proportionately excused from mortal sin. Yet if his intention is to rob and injure his neighbor, there may be a mortal sin even in these very little things, even as there may be through consent in a mere thought.
newadvent.org/summa/306600.htm