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The happy life is thought to be one of excellence; now an excellent life requires exertion, and does not consist of amusement. If Eudaimonia, or happiness, is activity in accordance with excellence, it is reasonable that it should in accordance with the highest excellence; and this will be that of the best thing in us.Aristotle, “Nichomachean Ethics”, Datalinks

The happy life is thought to be one of excellence; now an excellent life requires exertion, and does not consist of amusement. If Eudaimonia, or happiness, is activity in accordance with excellence, it is reasonable that it should in accordance with the highest excellence; and this will be that of the best thing in us.
Aristotle, “Nichomachean Ethics”, Datalinks