"He that shall scandalize one of
these little ones, that believe in Me, it were better for him that a
mill-stone should be hanged about his neck, and that he should be
drowned in the depth of the sea." For, as Jerome says on this
passage, "it is much better to receive a brief punishment for a
fault, than to await everlasting torments." Therefore scandal is a
mortal sin.

Obj. 3: Further, every sin committed against God is a mortal sin,
because mortal sin alone turns man away from God. Now scandal is a
sin against God, for the Apostle says (1 Cor. 8:12): "When you wound
the weak conscience of the brethren [*Vulg.: 'When you sin thus
against the brethren and wound their weak conscience'], you sin
against Christ." Therefore scandal is always a mortal sin.

_On the contrary,_ It may be a venial sin to lead a person into
venial sin: and yet this would be to give scandal. Therefore scandal
may be a venial sin.

_I answer that,_ As stated above (A. 1), scandal denotes a stumbling
whereby a person is disposed to a spiritual downfall. Consequently
passive scandal may sometimes be a venial sin, when it consists in a
stumbling and nothing more; for instance, when a person is disturbed
by a movement of venial sin occasioned by another's inordinate word
or deed: while sometimes it is a mortal sin, when the stumbling
results in a downfall, for instance, when a person goes so far as to
commit a mortal sin through another's inordinate word or deed.

Active scandal, if it be accidental, may sometimes be a venial sin;
for instance, when, through a slight indiscretion, a person either
commits a venial sin, or does something that is not a sin in itself,
but has some appearance of evil. On the other hand, it is sometimes a
mortal sin, either because a person commits a mortal sin, or because
he has such contempt for his neighbor's spiritual welfare that he
declines, for the sake of procuring it, to forego doing what he
wishes to do. But in the case of active direct scandal, as when a
person intends to lead another into sin, if he intends to lead him
into mortal sin, his own sin will be mortal; and in like manner if he
intends by committing a mortal sin himself, to lead another into
venial sin; whereas if he intends, by committing a venial sin, to
lead another into venial sin, there will be a venial sin of scandal.

And this suffices for the Replies to the Objections.
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FIFTH ARTICLE [II-II, Q. 43, Art. 5]

W