Sentence:  Dialectical subtleties, that the Schoolmen too often employ about Physiological Mysteries, are wont much more to declare the wit of him that uses them, then increase the knowledge or remove the doubts of sober lovers of truth. And such captious subtleties do indeed often puzzle and sometimes silence men, but rarely satisfy them. Being like the tricks of <WSD>Jugglers</WSD>, whereby men doubt not but they are cheated, though oftentimes they cannot declare by what slights they are imposed on. 
Meaning of the word marked with <WSD> tags:  A person who performs tricks using sleight of hand, a conjurer, prestidigitator.