NOR shall it any ways detract from the just reputation of this famous sect that its rise and institution are owing to such an author as I have described Jack to be, a person whose intellectuals were overturned and his brain shaken out of its natural position, which we commonly suppose to be a distemper, and call by the name of madness or frenzy. For if we take a survey of the greatest actions that have been performed in the world under the influence of single men, which are the establishment of new empires by conquest, the advance and progress of new schemes in philosophy, and the contriving as well as the propagating of new religions, we shall find the authors of them all to have been persons whose natural reason hath admitted great revolutions from their diet, their education, the prevalency of some certain temper, together with the particular influence of air and climate. Besides, there is something individual in human minds that easily kindles at the accidental approach and collision of certain circumstances, which, though of paltry and mean appearance, do often flame out into the greatest emergencies of life. For great turns are not always given by strong hands, but by lucky adaptation and at proper seasons, and it is of no import where the fire was kindled if the vapour has once got up into the brain. For the upper region of man is furnished like the middle region of the air, the materials are formed from causes of the widest difference, yet produce at last the same substance and effect. Mists arise from the earth, steams from dunghills, exhalations from the sea, and smoke from fire; yet all clouds are the same in composition as well as consequences, and the fumes issuing from a jakes will furnish as comely and useful a vapour as incense from an altar. Thus far, I suppose, will easily be granted me; and then it will follow that as the face of Nature never produces rain but when it is overcast and disturbed, so human understanding seated in the brain must be troubled and overspread by vapours ascending from the lower faculties to water the invention and render it fruitful. Now although these vapours (as it hath been already said) are of as various original as those of the skies, yet the crop they produce differs both in kind and degree, merely according to the soil. I will produce two instances to prove and explain what I am now advancing.