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10. Modality / C. Sources of Modality / 2. Necessity as Primitive

[necessities are self-justifying or self-evident]

3 ideas
Even God could not undo what has been done [Agathon]
Some necessary truths are brute, and others derive from final causes [Leibniz]
Necessity and possibility are fundamental, and there can be no reductive analysis of them [Stalnaker]