erefore their
unbelief is the gravest of all.

Obj. 2: Further, among heresies, the more detestable are those which
contradict the truth of faith in more numerous and more important
points: thus, the heresy of Arius, who severed the Godhead, was more
detestable than that of Nestorius who severed the humanity of Christ
from the Person of God the Son. Now the heathens deny the faith in
more numerous and more important points than Jews and heretics; since
they do not accept the faith at all. Therefore their unbelief is the
gravest.

Obj. 3: Further, every good diminishes evil. Now there is some good
in the Jews, since they believe in the Old Testament as being from
God, and there is some good in heretics, since they venerate the New
Testament. Therefore they sin less grievously than heathens, who
receive neither Testament.

_On the contrary,_ It is written (2 Pet. 2:21): "It had been better
for them not to have known the way of justice, than after they have
known it, to turn back." Now the heathens have not known the way of
justice, whereas heretics and Jews have abandoned it after knowing
it in some way. Therefore theirs is the graver sin.

_I answer that,_ As stated above (A. 5), two things may be considered
in unbelief. One of these is its relation to faith: and from this
point of view, he who resists the faith after accepting it, sins more
grievously against faith, than he who resists it without having
accepted it, even as he who fails to fulfil what he has promised,
sins more grievously than if he had never promised it. In this way
the unbelief of heretics, who confess their belief in the Gospel, and
resist that faith by corrupting it, is a more grievous sin than that
of the Jews, who have never accepted the Gospel faith. Since,
however, they accepted the figure of that faith in the Old Law, which
they corrupt by their false interpretations, their unbelief is a more
grievous sin than that of the heathens, because the latter have not
accepted the Gospel faith in any way at all.

The second thing to be considered in unbelief is the corruption of
matters of faith. In this respect, since heathens err on more points
than Jews, and these in more points than heretics, the unbelief of
heathens is more grievous than the unbelief of the Jews, and that of
the Jews than that of the heretics, except in such cases as that of
the Manichees, who, in matters of faith, err even more than heathens
do.

Of these two gravities th