Whether the sin of blasphemy is the greatest sin?

❌ Objection 1 : It would seem that the sin of blasphemy is not the greatest sin. For, according to Augustine (Enchiridion xii), a thing is said to be evil because it does harm. Now the sin of murder, since it destroys a man's life, does more harm than the sin of blasphemy, which can do no harm to God. Therefore the sin of murder is more grievous than that of blasphemy.

❌ Objection 2 : Further, a perjurer calls upon God to witness to a falsehood, and thus seems to assert that God is false. But not every blasphemer goes so far as to say that God is false. Therefore perjury is a more grievous sin than blasphemy.

❌ Objection 3 : Further, on Ps. 74:6, "Lift not up your horn on high," a gloss says: "To excuse oneself for sin is the greatest sin of all." Therefore blasphemy is not the greatest sin.