Aristotle: Nicomachean Ethics
Is happiness praiseworthy?
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Aristotle says that, while virtue is praiseworthy, happiness is above praise. It is easy to confuse the two, since virtuous living is a necessary condition for happiness. But Aristotle is careful to say that it is not happiness itself, since happiness itself requires right reason and good fortune, as well.
Aristotle, Nichomachean Ethics, Book I