  The object of knowledge is typically regarded as a kind of object or event, denoted by a term, rather than a proposition, expressed by a sentence. (Grammatically, the verb zhi (to know) most often takes a noun or noun phrase as its object.) Also, since to know a thing is to know how to distinguish it from other kinds of things, the object of knowledge is sometimes taken to be a distinction, as when the Mohists speak of “knowing the distinction between righteous and unrighteous” (Book 17, “Condemning Aggression”).