Some of them, when things succeed not, say: We are wise men, wee hear that the grasse grows, if the Art were true wee should have had it before other men: And so having brazen faces, lest wee should bee accounted undeserving men (as indeed they are, and also perverse) contemne, and undervalue the Art. This Science hates such men, and alwaies shews them the beginning in the end. Now we grant unto the unworthy, that this Art is nothing, but to the Lovers of vertue, and the true Searchers, and Sons of Wisdome, wee doe most highly commend it, and doe affirme it not only to be true, but altogether the truest: which, sometimes wee have really made good before men worthy of such a fight, I say before men of high, and low condition: (yet this Medicine was not made by us, but received from a friend, and yet most true) for the searching out of which wee have sufficiently instructed the Searchers thereof; whom if our Writings doe not please, let them read those of other Authors, which are easier, but with this Caution, That whatsoever they shall read, they shall alwaies compare it with the possibility of Nature, lest they assay any thing contrary to Nature. Neither let them beleeve, although it were written in the bookes of Philosophers, that Fire burns not, because this is contrary to Nature: but if it bee writ, that Fire hath a drying, and heating faculty, this is to bee beleeved, because it is according to Nature: For Nature doth alwaies agree with a sound judgment, and in Nature there is nothing difficult, all truth is plain. Then also let them learne, what things in Nature are of affinity with each other, which wee conceive may be easier done by our Writings, then any other, seeing wee think wee have wrote sufficiently, untill some other shall come, who shall set downe the whole Receipt so plaine, as to make cheese of Milke, which is not lawfull for us to doe.