Aristotle On Friendship Friendship is undoubtedly one of the most important elements in the books of Aristotle's ethical principles. Aristotle takes the idea of friendship to a serious degree. He categorizes them into three groups or types of friendships. This report will attempt to define each type of friendship as well as identify the role of friendship in a society. Aristotle considers friendship to be a necessity to live. He claims that no individual would chose to live without friends even if the individual had all of the other good things in life. He also describes friendship as a virtue