is written (Judith 9:17): "Hear me a
poor wretch making supplication to Thee, and presuming of Thy mercy."
Therefore presumption on God's mercy is not a sin.

Obj. 2: Further, presumption denotes excessive hope. But there cannot
be excess of that hope which is in God, since His power and mercy are
infinite. Therefore it seems that presumption is not a sin.

Obj. 3: Further, that which is a sin does not excuse from sin: for
the Master says (Sent. ii, D, 22) that "Adam sinned less, because he
sinned in the hope of pardon," which seems to indicate presumption.
Therefore presumption is not a sin.

_On the contrary,_ It is reckoned a species of sin against the Holy
Ghost.

_I answer that,_ As stated above (Q. 20, A. 1) with regard to
despair, every appetitive movement that is conformed to a false
intellect, is evil in itself and sinful. Now presumption is an
appetitive movement, since it denotes an inordinate hope. Moreover it
is conformed to a false intellect, just as despair is: for just as it
is false that God does not pardon the repentant, or that He does not
turn sinners to repentance, so is it false that He grants forgiveness
to those who persevere in their sins, and that He gives glory to
those who cease from good works: and it is to this estimate that the
movement of presumption is conformed.

Consequently presumption is a sin, but less grave than despair,
since, on account of His infinite goodness, it is more proper to God
to have mercy and to spare, than to punish: for the former becomes
God in Himself, the latter becomes Him by reason of our sins.

Reply Obj. 1: Presumption sometimes stands for hope, because even the
right hope which we have in God seems to be presumption, if it be
measured according to man's estate: yet it is not, if we look at the
immensity of the goodness of God.

Reply Obj. 2: Presumption does not denote excessive hope, as though
man hoped too much in God; but through man hoping to obtain from God
something unbecoming to Him; which is the same as to hope too little
in Him, since it implies a depreciation of His power; as stated above
(A. 1, ad 1).

Reply Obj. 3: To sin with the intention of persevering in sin and
through the hope of being pardoned, is presumptuous, and this does
not diminish, but increases sin. To sin, however, with the hope of
obtaining pardon some time, and with the intention of refraining from
sin and of repenting of it, is not presumptuous, but diminishes sin,