"Man is not a rational animal, but an animal capable of reason." - Jonathan Swift (1667-1745)
原文較麻煩:I have got materials towards a treatise proving the falsity of that definition animal rationale ["Man is a rational animal"] and to show it should be only rationis capax [= capable of reason]. — Jonathan Swift to Alexander Pope, 29 Sept. 1725 (spelling [etc.] modernized) http://open.salon.com/blog/richard_erlich/2012/01/08/man_is_a_rational_animal_sometimes