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2. Reason / B. Laws of Thought / 2. Sufficient Reason

4819	There is necessarily for each existent thing a cause why it should exist [Spinoza]
	Full Idea: There is necessarily for each existent thing a cause why it should exist.
	From: Baruch de Spinoza (The Ethics [1675], I Pr 08 n2)
	A reaction: The obvious response is 'how do you know that?' It has to the sort of a priori commitment we expect from a rationalist philosopher. It seems to me quite an appealing candidate for an axiom of human understanding.