(2) When, therefore, does the deception mentioned by you “ of speakingly boastingly ” take place. For when a certain error happens in the theurgic art, and not such autoptic , or self-visible, images are seen as ought to occur, but others, instead of these, then inferior powers assume the form of the more venerable orders, and pretend to be those whose forms they assume; and hence arrogant words are uttered by them, and such as exceed the authority which they possess. For, as it appears to me, if any fraud germinates from the first principle, much falsehood is derived from the perversion, which it is necessary the priest should learn from the whole order in the phasmata, and by the proper observation of which they are able to confute and reject the fictitious pretext of these inferior powers, as by no means pertaining to true and good spirits. Nor is it proper to introduce errors in the true judgment of things; for neither in other sciences or arts do we judge of their works from the aberrations which may happen to take place in them. You should not, therefore, here characterize things which are scarcely performed with rectitude through ten thousand labours, from the errors which may, through ignorance, befall them; but rather assert something else of them.