Nicomachean Ethics is a treatise on ethics that was written by Aristotle around 340 BCE which examines the question of how men should best live their lives. It is one of the most influential philosophical works ever published, with the height of its influence coming in Europe during the Middle Ages when Thomas Aquinas and others merged key ideas from Nicomachean Ethics into core Christian theology. The ten books that comprise Nicomachean Ethics are believed to be based on lecture notes from lectures given by Aristotle in the Lyceum.

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