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Gottfried Leibniz - There are two kinds of truths:...
There are two kinds of truths: those of reasoning and those of fact. The truths of reasoning are necessary and their opposite is impossible; the truths of fact are contingent and their opposites are possible. (Gottfried Leibniz)

There are two kinds of truths: those of reasoning and those of fact. The truths of reasoning are necessary and their opposite is impossible; the truths of fact are contingent and their opposites are possible.

Gottfried Leibniz

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contingent fact impossible necessary opposite possible reasoning

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