Therefore we make three propositions. First, that the foulest venereal acts are performed by such devils, not for the sake of delectation, but for the pollution of the souls and bodies of those to whom they act as Succubi or Incubi. Second, that through such action complete conception and generation by women can take place, inasmuch as they can deposit human semen in the suitable place of a woman’s womb where there is already a corresponding substance. In the same way they can also collect the seeds of other things for the working of their effects. Third, that in the begetting of such children only the local motion is to be attributed to devils, and not the actual begetting, which arises not from the power of the devil or of the body which he assumes, but from the virtue of him whose semen it was; wherefore the child is the son not of the devil, but of some man.
And here there is a clear answer to those who would contend that there are two reasons why devils cannot generate children:—First, that generation is effected by the formative virtue which exists in semen released from a living body; and that because the body assumed by devils is not of such a sort, therefore, etc. The answer is clear, that the devil deposits naturally formative semen in its proper place, etc. Secondly, it may be argued that semen has no power of generation except as long as the heat of life is retained in it, and that this must be lost when it is carried great distances. The answer is that devils are able to store the semen safely, so that its vital heat is not lost; or even that it cannot evaporate so easily on account of the great speed at which they move by reason of the superiority of the mover over the thing moved.
Question IV
By which devils are the operations of incubus and succubus practised?
Is it Catholic to affirm that the functions of Incubi and Succubi belong indifferently and equally to all unclean spirits? And it seems that it is so; for to affirm the opposite would be to maintain that there is some good order among them. It is argued that just as in the computation of the Good there are degrees and orders (see S. Augustine in his book on the nature of the Good), so also the computation of the Evil is based upon confusion. But as among the good Angels nothing can be without order, so among the bad all is disorder, and therefore they all indifferently follow these practices. See Job 10: A land of darkness, as darkness itself; and of the shadow of death, without any order, and where the light is as darkness.
Again, if they do not all indifferently follow these practices, this quality in them comes either from their nature, or from sin, or from punishment. But it does not come from their nature, since they are all without distinction given to sin, as was set out in the preceding question. For they are by nature impure spirits, yet not so unclean as to pejorate their good parts; subtle in wickedness, eager to do harm, swollen with pride, etc. Therefore these practices in them are due either to sin or to punishment. Then again, where the sin is greater, there is the punishment greater; and the higher angels sinned more greatly, therefore for their punishment they have the more to follow these filthy practices. If this is not so, another reason will be given why they do not indifferently practise these things.
And again, it is argued that where there is no discipline or obedience, there all work without distinction; and it is submitted that there is no discipline or obedience among devils, and no agreement. Proverbs 13: Among the proud there is always contention.
Again, just as because of sin they will all equally be cast into Hell after the Day of Judgement, so before that time they are detained in the lower mists on account of the duties assigned to them. We do not read that there is equality on account of emancipation, therefore neither is there equality in the matter of duty and temptation.
But against this there is the first gloss on 1 Corinthians 15: As long as the world endures Angels are set over Angels, men over men, and devils over devils. Also in Job 40 it speaks of the scales of Leviathan, which signify the members of the devil, how one cleaves to another. Therefore there is among them diversity both of order and of action.
Another question arises, whether or not the devils can be restrained by the good Angels from pursuing these foul practices. It must be said that the Angels to whose command the adverse Influences are subject are called Powers, as S. Gregory says, and S. Augustine (De Trinitate, 3). A rebellious and sinful spirit of life is subject to an obedient, pious and just spirit of life. And those Creatures which are more perfect and nearer to God have authority over the others: for the whole order of preference is originally and in the first place in God, and is shared by His creatures according as they approach more nearly to Him. Therefore the good Angels, who are nearest to God on account of their fruition in Him, which the devils lack, have preference over the devils, and rule over them.
And when it is urged that devils work much harm without any medium, or that they are not hindered because they are not subject to good Angels who might prevent them; or that if they are so subject, then the evil that
