Happiness requires both complete virtue and complete life. Friendship is one of the necessary conditions to complete human life because a life isolated from the community cannot be considered sufficient. Aristotle asserts that a human being is a political animal by nature. That is, man cannot fulfill his nature by himself alone. Moreover, friends are “the greatest external good” of a happy person since he can benefit his friends in his good fortune and be benefited by the friends in ill fortune.
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