Accordingly we must say that there is no unlawful divination in making use of dreams for the foreknowledge of the future, so long as those dreams are due to divine revelation, or to some natural cause inward or outward, and so far as the efficacy of that cause extends. But it will be an unlawful and superstitious divination if it be caused by a revelation of the demons, with whom a compact has been made, whether explicit, through their being invoked for the purpose, or implicit, through the divination extending beyond its possible limits.
This suffices for the Replies to the Objections. _______________________
SEVENTH ARTICLE [II-II, Q. 95, Art. 7]
Whether Divination by Auguries, Omens, and by Like Observations of
External Things Is Unlawful?
Objection 1: It would seem that divination by auguries, omens, and by like observations of external things is not unlawful. If it were unlawful holy men would not make use thereof. Now we read of Joseph that he paid attention to auguries, for it is related (Gen. 44:5) that Joseph's steward said: "The cup which you have stolen is that in which my lord drinketh and in which he is wont to divine (augurari)": and he himself afterwards said to his brethren (Gen. 44:15): "Know you not that there is no one like me in the science of divining?" Therefore it is not unlawful to make use of this kind of divination.
Obj. 2: Further, birds naturally know certain things regarding future occurrences of the seasons, according to Jer. 8:7, "The kite in the air hath known her time; the turtle, the swallow, and the stork have observed the time of their coming." Now natural knowledge is infallible and comes from God. Therefore it seems not unlawful to make use of the birds' knowledge in order to know the future, and this is divination by augury.
Obj. 3: Further, Gedeon is numbered among the saints (Heb. 11:32). Yet Gedeon made use of an omen, when he listened to the relation and interpreting of a dream (Judges 7:15): and Eliezer, Abraham's servant, acted in like manner (Gen. 24). Therefore it seems that this kind of divination is not unlawful.
On the contrary, It is written (Deut. 18:10): "Neither let there be found among you anyone . . . that observeth omens."
I answer that, The movements or cries of birds, and whatever dispositions one may consider in such things, are manifestly not the cause of future events: wherefore the future cannot be known therefrom as from its cause. It follows therefore that if anything future can be known from them, it will be because the causes from which they proceed are also the causes of future occurrences or are cognizant of them. Now the cause of dumb animals' actions is a certain instinct whereby they are inclined by a natural movement, for they are not masters of their actions. This instinct may proceed from a twofold cause. In the first place it may be due to a bodily cause. For since dumb animals have naught but a sensitive soul, every power of which is the act of a bodily organ, their soul is subject to the disposition of surrounding bodies, and primarily to that of the heavenly bodies. Hence nothing prevents some of their actions from being signs of the future, in so far as they are conformed to the dispositions of the heavenly bodies and of the surrounding air, to which certain future events are due. Yet in this matter we must observe two things: first, that such observations must not be applied to the foreknowledge of future things other than those which can be foreknown from the movements of heavenly bodies, as stated above (AA. 5, 6): secondly, that they be not applied to other matters than those which in some way may have reference to these animals (since they acquire through the heavenly bodies a certain natural knowledge and instinct about things necessary for their life—such as changes resulting from rain and wind and so forth).
In the second place, this instinct is produced by a spiritual cause, namely, either by God, as may be seen in the dove that descended upon Christ, the raven that fed Elias, and the whale that swallowed and vomited Jonas, or by demons, who make use of these actions of dumb animals in order to entangle our minds with vain opinions. This seems to be true of all such like things; except omens, because human words which are taken for an omen are not subject to the disposition of the stars, yet are they ordered according to divine providence and sometimes according to the action of the demons.