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Ideas for 'A Theory of Conditionals', 'Theory of Knowledge (2nd edn)' and 'Academica'

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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

2669	Dialectic assumes that all statements are either true or false, but self-referential paradoxes are a big problem [Cicero]
	Full Idea: It is a fundamental principle of dialectic that every statement is either true or false. So is this a true proposition or a false one: "If you say that you are lying and say it truly, you lie"?
	From: M. Tullius Cicero (Academica [c.45 BCE], II.xxix.95)