2279. The Sinfulness of Idolatry.—(a) Idolatry is a most grievous crime. It entails rebellion against the majesty of God, attack on the virtue of religion, unbelief or denial of faith, and scandal; and hence it is forbidden in the first commandment: “Thou shalt not have strange gods before Me. Thou shalt not adore them, nor serve them” (Exod., xx. 3 sqq.).
(b) Idolatry in itself and in its highest degree is the most grievous of sins, for it includes both hatred of God (since it would deprive Him of His unique excellence by giving His honors to creatures) and blasphemous unbelief (since the idolater publicly professes that God is not above all). Now, it was said above that unbelief, hatred of God and blasphemy are the most enormous of sins (see 820, 895, 1301, 1302), and so it follows that the worst form of idolatry is graver than other sins.
(c) Idolatry, by reason of the dispositions of the person who commits it, may be less grievous than other sins. Thus, it is worse to hate or deny God internally than to worship an idol externally only; it is worse to blaspheme with great hatred and contempt than to practise idolatry with less malice. Imperfection of the act, as in cases of ignorance or want of consent, makes the sin venial, or no formal sin at all.
2280. Comparison of Different Sins of Idolatry.—(a) Internal idolatry is worse than external idolatry, because the former, though not the latter, includes approval of the superstition committed. (b) Imperfect idolatry is worse than perfect idolatry, if both be considered precisely as idolatry, since the former proceeds from malice, and the latter from greater or less ignorance. (c) External idolatry is aggravated when its motive is more sinful or makes the act more voluntary (e.g., it is worse to pretend sacrifice to an idol if the motive is to ingratiate oneself with the idolaters or to spite the Christians, than if the motive is to escape death at the hands of the pagans).
2281. Idolatry Possible in Christian Worship.—The guilt of idolatry may be incurred even by Christians offering worship to God. (a) Thus, in the adoration of the Eucharist there would be idolatry, at least material, if an unconsecrated host were exposed for veneration or given in communion. (b) In the veneration of the Saints there would be idolatry, if they were honored or invoked as if they possessed divine attributes.
2282. Definition of Divination.—Divination (soothsaying, fortune-telling) is a form of superstition in which the evil spirits are invoked explicitly or implicitly with a view to the discovery of what is future or occult.
(a) It is a form of superstition, because it seeks to obtain through natural means knowledge that cannot be had except from God, or substitutes other teachers for God.
(b) It contains the invocation of evil spirits, for the information sought surpasses the powers of nature and, being illicit, cannot be expected from supernatural powers that are good (such as God, the Angels, the Saints).
(c) The invocation is explicit or implicit. There is explicit calling on the evil spirits when one prays to the demon or makes an agreement with him; there is implicit invocation when one does not address an evil spirit, but does employ means for the discovery of knowledge which are not adequate, either from their nature or from the will of God, for the desired effect.
(d) The knowledge desired is of future or occult things, that is, of such things as cannot be foreseen in their causes or discovered by natural means (such as the future acts of free beings, the secret thoughts of the heart).