Although Socrates left no writings, he is of landmark importance in Western thought. By his example, philosophy was turned away from its prior emphasis on natural science and became directed more toward questions of ethics—that is, the right conduct of life. In the words of the Roman thinker Cicero (ca. 50 BCE), "Socrates was the first to call philosophy down from the sky." Socrates profoundly influenced his pupil Plato. Socrates' central conclusions—that happiness depends solely on living a moral life, and that moral virtue is equivalent to knowledge and is therefore teachable—became the springboard for Plato's elaborate theory of reality and system of ethics. Socrates' equation of virtue with knowledge led to the daring corollary that evil is ignorance and hence unintentional. According to Socrates, the evildoer acts mistakenly in harming his or her own soul. Socrates himself taught no doctrine, claiming simply, "I know nothing." This professed ignorance was denoted by the Greek word eironeia: that is, the famous Socratic irony. Unlike other philosophers, he never founded a school or charged fees for lessons. At Athens he attracted a following of young, aristocratic men, with whom he would dispute ethical or political issues. Since he took no money, his goal was evidently to prepare these students for public office by teaching them to think for themselves. His "Socratic method" consisted of asking questions, particularly in pursuit of definitions. For example: "You say that this man is a better citizen than his opponent? Let us consider therefore what we mean by 'good citizen.'" This question-andanswer process forced the respondent to examine his own preconceptions, in a search for general truths. Socrates' disputations and skeptical outlook led him to be associated—unfairly, from his viewpoint—with those well-paid teachers of intellectual skills, the sophists. One famous sophist, Protagoras of Abdera, who taught at Athens around 455–415 BCE, is recorded as believing that expertise (Greek: arete) in most fields is teachable. Protagoras surely inspired Socrates' similar but more profound view that moral virtue (likewise denoted by the Greek word arete) is teachable. Among Socrates' well-heeled students were two destined for great importance in Athenian politics: the brilliant but erratic Alcibiades and the extreme right-winger Kritias (who was killed in 403 BCE while trying to abolish Athenian democracy). The link with Kritias was probably responsible for Socrates' death. In 399 BCE the 70-year-old philosopher was prosecuted for corrupting the youth (a charge implicitly referring to Kritias and Alcibiades) and for impiety. After making a flamboyantly nonconciliatory defense speech, Socrates was found guilty by the jury of 501 Athenians and was sentenced to die by being given poison. The famous prison scene, in which Socrates discusses the soul's immortality with his visitors before drinking the fatal hemlock, is recounted in Plato's dialogue Phaedo. Information about Socrates comes mainly from two sources. Plato's fictional dialogues contain much biographical information about Socrates while also foisting onto him Plato's own more complex philosophical theories. Here the insoluble question arises: What aspects of Plato's Socrates show us the real Socrates, and how much is just a mask for Plato's own thought? Probably a more biographical Socrates is portrayed in Plato's early work (such as the Krito or Euthyphro), while the Socrates in the Republic and later dialogues is a more fictionalized character, who discusses concepts that the real Socrates never explored. The other source is Xenophon, a stolid Athenian soldier and historian who was one of Socrates' disciples and who wrote about him in three nonfiction memoirs, Memorabilia, Symposium, and Apology. (The latter two titles also belong to works by Plato.) That Socrates could be the beloved mentor of two such different people as Plato and Xenophon is itself revealing. Other information comes from Aristophanes' stage comedy Clouds (performed in 423 BCE), in which a crackpot scientist named Socrates operates a "Thinking Shop." Clearly the real Socrates was a dynamic personality who fascinated friend and foe alike. When one contemporary Athenian asked the oracle at Delphi who was the wisest of all men, the answer came back "Socrates." He was born into the Athenian middle class, the son of a stonecutter or sculptor named Sophroniskos. Socrates came of age during the political primacy of Pericles, when Athens reached its zenith as a radical democracy and imperial naval power—twin developments that alienated many conservative Athenians. As a youth, Socrates supposedly studied under a disciple of the philosopher Anaxagoras, but became discouraged by the emphasis on physics and cosmology rather than ethics. During the Peloponnesian War between Athens and Sparta (431–404 BCE), Socrates served as foot soldier in the Potidaea campaign (432–430 BCE), at the disastrous Battle of Delium (424 BCE), and at Amphipolis (422 BCE), by which time he would have been about 47 years old. On campaign, he distinguished himself by his physical endurance and courage. One anecdote describes Socrates striding calmly amid the Athenian retreat from Delium, defying the pursuing enemy cavalry. In later life he repeatedly resisted the political hysteria of Athens in crisis. In 406 BCE, while serving a citizen's normal duty on the council panel to prepare the agenda for the Athenian assembly, Socrates refused to go along with an illegal motion ordering a group trial for six commanders charged with negligence after the sea battle of Arginusae. In 403 BCE Socrates defied his old pupil Kritias, who had seized power in the coup of the Thirty Tyrants: Brought before the Thirty, Socrates refused to help them arrest a certain intended victim. No doubt Socrates himself would have become a victim of the Thirty, had not their reign of terror soon ended. Instead, Socrates was denounced by prominent accusers after the restoration of democracy. That Socrates should have been prosecuted under the democracy is significant. An original thinker who defied convention, Socrates was known for his antidemocratic sentiments. As Xenophon's memoirs make clear, he criticized the democracy's inability to entrust its government to the most apt and expert people. Without advocating revolution or dictatorship, Socrates seems to have favored a meritocracy, with power entrusted to a worthy ruling class. Such beliefs— although purely theoretical—must have seemed damning after Critias' right-wing coup. Following the Thirty's downfall, the Athenians' wrath turned against Socrates. Across the centuries, Socrates' eccentric personality communicates itself. Although magnetic in character, he was physically unattractive in middle age—balding, pug-nosed, and paunchy. His contemporaries humorously compared him to the mythical figure Silenus. Socrates was famous for his austerity: Impervious to cold and fatigue, he almost always went barefoot, even over frozen winter ground at the siege of Potidaea. He had three sons by his wife, Xanthippe (whom several sources describe as a bad-tempered shrew). Socrates may have practiced a stonecutter's trade, like his father, but he evidently spent most of his time at the Athenian sports grounds where educated men of leisure congregated. There he would conduct semipublic debates with his followers or rivals. Political Thought of Socrates: Often compared to Christ because he criticized the religious establishment, was executed by the state, but forgave his accusers, Socrates was a teacher of Plato, influencing all classical political thought. Most famous for his dictum "Know Thyself" and "the unexamined life is not worth living," Socrates begins the Western philosophic tradition. His "Socratic method" of educating students by asking them questions continues in the Oxford tutorial system, the adversarial legal method, and the free press as a "Fourth Estate," critically examining the government. Socrates wrote nothing himself, but his philosophical life and activity is written by various disciplines, especially in the Dialogues of Plato. The most biographical is The Apology, a description of Socrates' trial in Athens on charges of heresy and corrupting the young. In his defense ("apology"), Socrates provides logical refutation of both charges and reveals, through questioning, their true source in his challenging of the established authority in Greece. Most serious was his embarrassing of the proud, self-satisfied, prominent leaders of Athens, who only think they are wise, when in fact their pride and arrogance makes them foolish and ignorant. True wisdom, for Socrates, is a humble appreciation of one's own lack of knowledge. Such personal, intellectual humility fuels the search for knowledge and is the true "philosopher's" ("lover of wisdom") premier trait. Most prominent people are infected with the sin of pride and therefore are stupid. This attitude lands Socrates in court, in jail, and finally to being executed by the state. He insists that he is not being disrespectful to Athens's leaders or disloyal to his country; quite the contrary, Greece in its Golden Age has become so rich, proud, and decadent that it needs a patriotic "gadfly" to sting it and wake it up, according to Socrates. He did that to save his country. The Platonic Dialogue Crito details Socrates' time, his obedience to the states' laws, his patriotism, and his love of country. He even refuses to escape and save his own life when the opportunity presents itself. Socrates insists that he is following a "higher law," God's command, when he criticizes the state. Elsewhere, Socrates is recorded as critical of the Athenean democracy because the majority of people are selfish, proud, and ignorant. He faults the political leaders for pandering to the masses to be elected, rather than having any independent intelligence, judgment, or principles. These Socratic views are developed by his greatest student, Plato, especially in The Republic. His concern for education leads to a Platonic state, ruled by a philosopher-King and preoccupied with educating the virtues of all its citizens. His plea that Athens treat his sons as he treated them and that then they will have "justice" (getting their "due") becomes the central theme of Plato's Republic—the definition of justice and how to achieve it. Many subsequent philosophers claim Socrates as their inspiration and example, including John Stuart Mill, C. S. Lewis, and Henry David Thoreau.