889. Internal blasphemy does not differ from unbelief or disrespect for God. We are concerned here, therefore, only with external blasphemy, which is contrary to the external profession of faith. External blasphemy is opposed to faith either directly (by denying what is of faith) or indirectly (by showing disrespect to what is of faith), and hence it is either heretical or non-heretical.
(a) Heretical blasphemy affirms about God something false, or denies about Him something true. The false affirmation is made directly, when some created imperfection is attributed to God, or indirectly, when some divine perfection is attributed to a creature. Example: It is heretical blasphemy to affirm that God is a tyrant or the cause of sin, or that man is able to overcome God. It is also heretical blasphemy to deny that God is able to perform miracles, that His testimony is true, etc.
(b) Non-heretical blasphemy affirms or denies something about God according to truth, but in a mocking or blaming way. This sin is opposed, therefore, to reverence rather than to faith, and will be treated later among the sins against the virtue of religion (see Vol. II). Example: A person in anger at God says scornfully: “God is good!”
890. The nature of heretical blasphemy will better appear, if we compare it with other kinds of speech disrespectful to God.
(a) It differs from maledictions or curses, (e.g., “May God destroy you!”), because the one directly offended in blasphemy is God Himself, while in a curse it is some creature of God.
(b) It differs from non-heretical blasphemy, from perjury and disregard of vow, from vain use of the name of God, because none of these necessarily proceeds from a lack of faith, as does heretical blasphemy. Non-heretical blasphemy proceeds from hatred or contempt of God, perjury from presumption, disregard of vow from disobedience, vain use of the Divine Name from irreverence.
(c) Heretical blasphemy differs from temptation of God (e.g., “God must help me now if He can,” said by one who exposes himself rashly to danger), for, while temptation of God implies doubt, it is directly an act of irreverence by which one presumes to put God Himself to proof, whereas heretical blasphemy is directly an act of denial of truth.
891. Heretical blasphemy calumniates God, either in His own attributes and perfections, or in those created persons or things that are specially His by reason of friendship or consecration. Thus, we have: (a) blasphemy that attacks the Divine Being Himself, as was explained above; (b) blasphemy that attacks what is especially dear to God, which consists in remarks or acts derogatory to the Blessed Virgin, the Saints, the Sacraments, the crucifix, the Bible, etc.
892. Unlike God, creatures are subject to imperfections, moral or physical, and thus it is not always erroneous or blasphemous to attribute imperfections to the Saints or sacred things.
(a) If sacred persons or things are spoken ill of precisely on account of their relation to God, or in such a way that the evil said of them reverts on God Himself, blasphemy is committed. Example: It is blasphemous to say that the Mother of God was not a Virgin, that St. Peter was a reprobate, that St. Anthony and St. Simeon Stylites were snobbish or eccentric, that the Sacraments are nonsense, that relics are an imposture, etc.