Leviathan

And therefore, when the Discourse is put into Speech, and begins with the Definitions of Words, and proceeds by Connexion of the same into general Affirmations, and of these again into Syllogismes, the end or last sum is called the Conclusion; and the thought of the mind by it signified is that conditional Knowledge, or Knowledge of the consequence of words, which is commonly called Science. But if the first ground of such Discourse be not Definitions, or if the Definitions be not rightly joyned together into Syllogismes, then the End or Conclusion is again OPINION, namely of the truth of somewhat said, though sometimes in absurd and senslesse words, without possibility of being understood. When two, or more men, know of one and the same fact, they are said to be CONSCIOUS of it one to another; which is as much as to know it together.

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