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Ideas for 'fragments/reports', 'Inessential Aristotle: Powers without Essences' and 'A Specimen of Discoveries'

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2. Reason / A. Nature of Reason / 4. Aims of Reason

5035	The two basics of reasoning are contradiction and sufficient reason [Leibniz]
	Full Idea: The two first principles of reasoning are: the principle of contradiction, and the principle of the need for giving a reason.
	From: Gottfried Leibniz (A Specimen of Discoveries [1686], p.75)
	A reaction: Could animals have any reasoning ability (say, in solving a physical problem)? Leibniz's criteria both require language. Note the overlapping of the principle of sufficient reason (there IS a reason) with the contractual idea of GIVING reasons.