Aristotle's Nicomachean Ethics discusses the concept of eudaimonia (happiness or human flourishing). It argues that eudaimonia results from living according to reason and possessing moral virtue as well as external goods like wealth and social status. Moral virtue is developed through habituation from a young age and practicing virtuous actions. The virtues involve finding the golden mean between excess and deficiency. Key virtues are courage, temperance, and justice. Justice involves both obeying just laws and treating others fairly based on their merits. Freedom and moral responsibility are also discussed as relating to developing virtue and eudaimonia.