Thought Experiments
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A thought experiment is an invented case built to test a moral principle by isolating the single factor in question.
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To test whether a promise binds after the promisee dies, imagine breaking it with every consequence unchanged. Only the promise itself now varies.
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Objecting "that would never happen" changes the subject; the invented case tests the principle, not the news.