3. We must, indeed, endeavour to ascertain whether that wisdom of the princes of this world, with which they endeavour to imbue men, is introduced into their minds by the opposing powers, with the purpose of ensnaring and injuring them, or only for the purpose of deceiving them, i.e. not with the object of doing any hurt to man; but, as these princes of this world esteem such opinions to be true, they desire to impart to others what they themselves believe to be the truth: and this is the view which I am inclined to adopt. For as, to take an illustration, certain Greek authors, or the leaders of some heretical sect, after having imbibed an error in doctrine instead of the truth, and having come to the conclusion in their own minds that such is the truth, proceed, in the next place, to endeavour to persuade others of the correctness of their opinions; so, in like manner, are we to suppose is the procedure of the princes of this world, in which to certain spiritual powers has been assigned the rule over certain nations, and who are termed on that account the princes of this world. There are besides, in addition to these princes, certain special energies of this world, i.e. spiritual powers, which bring about certain effects, which they have themselves, in virtue of their freedom of will, chosen to produce, and to these belong those princes who practise the wisdom of this world: there being, for example, a peculiar energy and power, which is the inspirer of poetry; another, of geometry; and so a separate power, to remind us of each of the arts and professions of this kind. Lastly, many Greek writers have been of opinion that the art of poetry cannot exist without madness; whence also it is several times related in their histories, that those whom they call poets were suddenly filled with a kind of spirit of madness. And what are we to say also of those whom they call diviners, from whom, by the working of those demons who have the mastery over them, answers are given in carefully constructed verses? Those persons, too, whom they term Magi or Malevolent, frequently, by invoking demons over boys of tender years, have made them repeat poetical compositions which were the admiration and amazement of all. Now these effects we are to suppose are brought about in the following manner: As holy and immaculate souls, after devoting themselves to God with all affection and purity, and after preserving themselves free from all contagion of evil spirits, and after being purified by lengthened abstinence, and imbued with holy and religious training, assume by this means a portion of divinity, and earn the grace of prophecy, and other divine gifts; so also are we to suppose that those who place themselves in the way of the opposing powers, i.e. who purposely admire and adopt their manner of life and habits, receive their inspiration, and become partakers of their wisdom and doctrine. And the result of this is, that they are filled with the working of those spirits to whose service they have subjected themselves.