section_path: History/Ancient/Classical period
section_name: Classical period
paragraph_text: Classical period
  
  The Classical period of ancient Greek philosophy centers on Socrates and the two generations of students who followed.
  
  Socrates experienced a life-changing event when his friend, Chaerephon visited the Oracle of Delphi where the Pythia told him that no one in Athens was wiser than Socrates. Learning of this, Socrates subsequently spent much of his life questioning anyone in Athens who would engage him, in order to investigate the Pithia's claim. Socrates developed a critical approach, now called the Socratic method, to examine people's views. He focused on issues of human life: eudaimonia, justice, beauty, truth, and virtue. Although Socrates wrote nothing himself, two of his disciples, Plato and Xenophon, wrote about some of his conversations, although Plato also deployed Socrates as a fictional character in some of his dialogues. These Socratic dialogues display the Socratic method being applied to examine philosophical problems.
  
  Socrates's questioning earned him enemies who eventually accused him of impiety and corrupting the youth. For this, he was tried by the Athenian democracy, was found guilty, and was sentenced to death. Although his friends offered to help him escape from prison, Socrates chose to remain in Athens and abide by his principles. His execution consisted of drinking poison hemlock. He died in 399 BCE.
  
  After Socrates' death, Plato founded the Platonic Academy and Platonic philosophy. As Socrates had done, Plato identified virtue with knowledge. This led him to questions of epistemology on what knowledge is and how it is acquired.
  
  Socrates had several other students who also founded schools of philosophy. Two of these were short-lived: the Eretrian school, founded by Phaedo of Elis, and the Megarian school, founded by Euclid of Megara. Two others were long-lasting: Cynicism, founded by Antisthenes, and Cyrenaicism, founded by Aristippus. The Cynics considered life's purpose to live in virtue, in agreement with nature, rejecting all conventional desires for wealth, power, and fame, leading a simple life free from all possessions. The Cyrenaics promoted a philosophy nearly opposite that of the Cynics, endorsing hedonism, holding that pleasure was the supreme good, especially immediate gratifications; and that people could only know their own experiences, beyond that truth was unknowable.
  
  The final school of philosophy to be established during the Classical period was the Peripatetic school, founded by Plato's student, Aristotle. Aristotle wrote widely about topics of philosophical concern, including physics, biology, zoology, metaphysics, aesthetics, poetry, theater, music, rhetoric, politics, and logic. Aristotelian logic was the first type of logic to attempt to categorize every valid syllogism. His epistemology comprised an early form of empiricism. Aristotle criticized Plato's metaphysics as being poetic metaphor, with its greatest failing being the lack of an explanation for change. Aristotle proposed the four causes model to explain change – material, efficient, formal, and final – all of which were grounded on what Aristotle termed the unmoved mover. His ethical views identified eudaimonia as the ultimate good, as it was good in itself. He thought that eudaimonia could be achieved by living according to human nature, which is to live with reason and virtue, defining virtue as the golden mean between extremes. Aristotle saw politics as the highest art, as all other pursuits are subservient to its goal of improving society. The state should aim to maximize the opportunities for the pursuit of reason and virtue through leisure, learning, and contemplation. Aristotle tutored Alexander the Great, who conquered much of the ancient Western world. Hellenization and Aristotelian philosophy have exercised considerable influence on almost all subsequent Western and Middle Eastern philosophers.