Now we take the human function to be a certain kind of life, and take this life to be the soul’s activity and actions that express reason, and the function of a good man to be the good and noble performance of these. Each function is completed well when its completion expresses the proper virtue. Therefore, the human good turns out to be the soul’s activity that expresses virtue. And if there are more virtues than one, the good will express the best and most complete virtue. Moreover, it will be in a complete life. For one swallow does not make a spring, nor does one day; nor, similarly, does one day or a short time make us blessed and happy.
Aristotle, Nichomachean Ethics
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Aristotle
