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Ideas for 'works', 'Kinds of Minds' and 'Monadology'

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10. Modality / D. Knowledge of Modality / 1. A Priori Necessary

2112	Truths of reason are known by analysis, and are necessary; facts are contingent, and their opposites possible [Leibniz]
	Full Idea: There are two kinds of truths: of reasoning and of facts. Truths of reasoning are necessary and their opposites impossible. Facts are contingent and their opposites possible. A necessary truth is known by analysis.
	From: Gottfried Leibniz (Monadology [1716], §33)