(2) Whether blasphemy is always a mortal sin?
(3) Whether blasphemy is the most grievous sin?
(4) Whether blasphemy is in the damned? _______________________
FIRST ARTICLE [II-II, Q. 13, Art. 1]
Whether Blasphemy Is Opposed to the Confession of Faith?
Objection 1: It would seem that blasphemy is not opposed to the confession of faith. Because to blaspheme is to utter an affront or insult against the Creator. Now this pertains to ill-will against God rather than to unbelief. Therefore blasphemy is not opposed to the confession of faith.
Obj. 2: Further, on Eph. 4:31, "Let blasphemy . . . be put away from you," a gloss says, "that which is committed against God or the saints." But confession of faith, seemingly, is not about other things than those pertaining to God, Who is the object of faith. Therefore blasphemy is not always opposed to the confession of faith.
Obj. 3: Further, according to some, there are three kinds of blasphemy. The first of these is when something unfitting is affirmed of God; the second is when something fitting is denied of Him; and the third, when something proper to God is ascribed to a creature, so that, seemingly, blasphemy is not only about God, but also about His creatures. Now the object of faith is God. Therefore blasphemy is not opposed to confession of faith.
On the contrary, The Apostle says (1 Tim. 1:12, 13): "I . . . before was a blasphemer and a persecutor," and afterwards, "I did it ignorantly in" my "unbelief." Hence it seems that blasphemy pertains to unbelief.
I answer that, The word blasphemy seems to denote the disparagement of some surpassing goodness, especially that of God. Now God, as Dionysius says (Div. Nom. i), is the very essence of true goodness. Hence whatever befits God, pertains to His goodness, and whatever does not befit Him, is far removed from the perfection of goodness which is His Essence. Consequently whoever either denies anything befitting God, or affirms anything unbefitting Him, disparages the Divine goodness.