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Ideas for 'fragments/reports', 'Intro to 'Rationality in Greek Thought'' and 'De Anima'

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2 ideas

2. Reason / B. Laws of Thought / 2. Sufficient Reason
Chrysippus said the uncaused is non-existent [Chrysippus, by Plutarch]
     Full Idea: Chrysippus said that the uncaused is altogether non-existent.
     From: report of Chrysippus (fragments/reports [c.240 BCE]) by Plutarch - 70: Stoic Self-contradictions 1045c
     A reaction: The difficulty is to see what empirical basis there can be for such a claim, or what argument of any kind other than an intuition. Induction is the obvious answer, but Hume teaches us scepticism about any claim that 'there can be no exceptions'.
2. Reason / B. Laws of Thought / 4. Contraries
From one thing alone we can infer its contrary [Aristotle]
     Full Idea: One member of a pair of contraries is sufficient to discern both itself and its opposite.
     From: Aristotle (De Anima [c.329 BCE], 411a02)
     A reaction: This obviously requires prior knowledge of what the opposite is. He says you can infer the crooked from the straight. You can hardly use light in isolation to infer dark [see DA 418b17]. What's the opposite of a pig?