Sentence:  If then such be the capacitie and receit of the mind of Man, it is manifest, that there is no daunger at all in the proportion or quantitie of knowledge howe large soeuer; least it should make it swell or outcompasse it selfe; no, but it is meerely the qualitie of knowledge, which be it in quantitie more or lesse, if it bee taken without the true <WSD>correctiue</WSD> thereof, hath in it some Nature of venome or malignitie, and some effects of that venome which is ventositie or swelling. 
Meaning of the word marked with <WSD> tags:  Something that corrects or counteracts something.