there be a feruent appetite, and vehement desire to hurt and mischiefe. For then the nature of the complexion and soundnesse woorketh more forcibly by the cogitations of the soule, and longing desires that it hath. For which cause the Leper that earnestly wisheth, and with exceeding carefulnesse intendeth to infect some body that standeth before him, doth both more speedily and dangerously infect him, then he could haue done if he had not before hand thought hereof, desired and purposed in. For Nature (as _Auicen_ teacheth, in the foresayde places) obeyeth the thoughts, and vehement desires of the Soule: yea, there should bee no operation at all in men, if the natural vertue in the members did not subiect it selfe to the thoughts and desires of the soule. For (as _Auicen_ teacheth in the thirde of the _Metaphysickes_) the first moouer is a thought, and the next a desire conformable to the thought: And last of all, the vertue of the Soule in the members, which yeeldeth obedience to the desire and thought, and that both in euill and good. Whereupon when these thinges are to bee seene in a man, a good complexion, health of bodie, youth, beautie, comly proportion of the members, and a Soule free from sinne, an earnest thought and vehement desire to some worke, then whatsoeuer may be effected by the kinde and vertue of man, by the spirits and naturall heate, it must of necessitie be more forcibly and throughly wrought by these & such like Spirites, Vapours, and influences, then if anie of these were wanting, especially if there bee an earnest desire and forcible intention. So then many straunge matters may bee brought to passe by the woordes and workes of man, when all the fore-named causes doo concurre and meete together: for wordes proceede from within by the thoughts of the Soule, and desire, commeth by the motion of the Spirites, heate and vocall arterie-And the generation of these thinges hath open wayes, through which is a great passage of Spirits, heate, euaporation, vertue and kindes, which may bee made by the Soule and heart. By reason whereof, there are alterations and chaunges made in thinges spirituall (other things being answerable) by words according to that naturall power which is due vnto them. For wee see that by reason of these and such like arteries, gaspings and yawnings, and many resolutions of the Spirites, and of heate arise from the heart in the inwarde partes: which sometimes hurt vs, when they proceede from a crazie body: that is, of an euill complexion: and againe they greatly profite and comfort vs, when they come from a pure and sound bodie of a good complexion. In like sort therefore, there may be some naturall operations in the generation and pronunciation of woordes, with an intent and desire of working: so that not without good cause we vse to say, that a liuely voice is of great efficacie, not because it hath that vertue, which the Magitians dreame of: or that it is able to make and alter as others