For both Plato and Aristotle the good appears to be happiness. For Plato, this is where his interpretation of the meaning of Eudaimonism takes precedence. Eudaimonism takes a three part definition in this respect: (1) living in harmony with one’s self (i.e. justice), (2) living in truth to one’s self (i.e. integrity), and (3) which is somewhat of a combination of the above two: a feeling of happiness or self-satisfaction associated with the activity of self-fulfillment. This happiness, which appears to be the good, is only attainable through the exercise of certain virtues (i.e. cardinal virtues). However, after a grueling inspection of each philosopher's beliefs, Kant's conception of the good was found to be more compelling than Aristotle's, in that Kant's view addressed the good in a universal
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