resumption seems to imply immoderate hope. Now the
object of hope is an arduous possible good: and a thing is possible
to a man in two ways: first by his own power; secondly, by the power
of God alone. With regard to either hope there may be presumption
owing to lack of moderation. As to the hope whereby a man relies on
his own power, there is presumption if he tends to a good as though
it were possible to him, whereas it surpasses his powers, according
to Judith 6:15: "Thou humblest them that presume of themselves." This
presumption is contrary to the virtue of magnanimity which holds to
the mean in this kind of hope.

But as to the hope whereby a man relies on the power of God, there
may be presumption through immoderation, in the fact that a man tends
to some good as though it were possible by the power and mercy of
God, whereas it is not possible, for instance, if a man hope to
obtain pardon without repenting, or glory without merits. This
presumption is, properly, the sin against the Holy Ghost, because, to
wit, by presuming thus a man removes or despises the assistance of
the Holy Spirit, whereby he is withdrawn from sin.

Reply Obj. 1: As stated above (Q. 20, A. 3; I-II, Q. 73, A. 3) a sin
which is against God is, in its genus, graver than other sins. Hence
presumption whereby a man relies on God inordinately, is a more
grievous sin than the presumption of trusting in one's own power,
since to rely on the Divine power for obtaining what is unbecoming to
God, is to depreciate the Divine power, and it is evident that it is
a graver sin to detract from the Divine power than to exaggerate
one's own.

Reply Obj. 2: The presumption whereby a man presumes inordinately on
God, includes self-love, whereby he loves his own good inordinately.
For when we desire a thing very much, we think we can easily procure
it through others, even though we cannot.

Reply Obj. 3: Presumption on God's mercy implies both
conversion to a mutable good, in so far as it arises from an
inordinate desire of one's own good, and aversion from the immutable
good, in as much as it ascribes to the Divine power that which is
unbecoming to it, for thus man turns away from God's power.
_______________________

SECOND ARTICLE [II-II, Q. 21, Art. 2]

Whether Presumption Is a Sin?

Objection 1: It would seem that presumption is not a sin. For no sin
is a reason why man should be heard by God. Yet, through presumption
some are heard by God, for it