Aristotle made several efforts to explain how moral conduct contributes to the good life for human agents, including the Eqikh EudaimonhV (Eudemian Ethics) and the Magna Moralia, but the most complete surviving statement of his views on morality occurs in the Eqikh Nikomacoi (Nicomachean Ethics).
There he considered the natural desire to achieve happiness, described the operation of human volition and moral deliberation, developed a theory of each virtue as the mean between vicious extremes, discussed the value of three kinds of friendship, and defended his conception of an ideal life of intellectual pursuit.
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But on Aristotle’s view, the lives of individual human beings are invariably linked together in a social context. In the Peri PoliV (Politics) he speculated about the origins of the state, described and assessed the relative merits of various types of government, and listed the obligations of the individual citizen.
He may also have been the author of a model PoliteiaV Aqhnawn (Constitution of Athens), in which the abstract notion of constitutional government is applied to the concrete life of a particular society.
Aristotle was appointed as the head of the royal academy of Macedon. During that time he gave lessons not only to Alexander, but also to two other future kings: Ptolemy and Cassander. In his Politics, Aristotle states that only one thing could justify monarchy, and that was if the virtue of the king and his family were greater than the virtue of the rest of the citizens put together. Tactfully, he included the young prince and his father in that category. Aristotle encouraged Alexander toward eastern conquest, and his attitude towards Persia was unabashedly ethnocentric. In one famous example, he counsels Alexander to be ‘a leader to the Greeks and a despot to the barbarians, to look after the former as after friends and relatives, and to deal with the latter as with beasts or plants’.
By 335 BC he had returned to Athens, establishing his own school there known as the Lyceum. Aristotle conducted courses at the school for the next twelve years. While in Athens, his wife Pythias died and Aristotle became involved with Herpyllis of Stageira, who bore him a son whom he named after his father, Nicomachus. According to the Suda, he also had an eromenos, Palaephatus of Abydus.
It is during this period in Athens from 335 to 323 BC when Aristotle is believed to have composed many of his works. Aristotle wrote many dialogues, only fragments of which survived. The works that have survived are in treatise form and were not, for the most part, intended for widespread publication, as they are generally thought to be lecture aids for his students. His most important treatises include Physics, Metaphysics, Nicomachean Ethics, Politics, De Anima (On the Soul) and Poetics.
Aristotle not only studied almost every subject possible at the time, but made significant contributions to most of them. In physical science, Aristotle studied anatomy , astronomy, embryology, geography, geology, meteorology, physics and zoology. In philosophy, he wrote on aesthetics, ethics, government, metaphysics, politics, economics, psychology, rhetoric and theology.He also studied education, foreign customs, literature and poetry. His combined works constitute a virtual encyclopedia of Greek knowledge. It has been suggested that Aristotle was probably the last person to know everything there was to be known in his own time.
Near the end of Alexander’s life, Alexander began to suspect plots against himself, and threatened Aristotle in letters. Aristotle had made no secret of his contempt for Alexander’s pretense of divinity, and the king had executed Aristotle’s grandnephew Callisthenes as a traitor. A widespread tradition in antiquity suspected Aristotle of playing a role in Alexander’s death, but there is little evidence for this.