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 Socrates
SOCRATES, the celebrated Greek philosopher and moralist, was born at Athens in the year 469 B.C. His father, Sophroniskus, was a sculptor and he followed the same profession in the early part of his life. His family was respectable in descent, but humble in point of means. He had the usual education of the Athenian citizen, which included not only a knowledge of the mother tongue, andreadings in the Greek poets, but also the elements of arithmetic, geometry and astronomy as then known. Excepting in connection with his philosophical career, few circumstances of his life are known. He served as a hoplite, or heavy-armed foot-soldier, at the siege of Potidaea, at the battle of Deliurn, and at Amphipolis, and his bravery and endurance were greatly extolled by his friends.Somewhere about the middle period of his life, he relinquished his profession as statuary, and gave himself up to the career that made him famous. Deservedly styled a philosopher, he neither secluded himself for study, nor opened a school for the regular instruction of pupils. He disclaimed the appellation of teacher; his practice was to talk or converse, "to prattle without end," as his enemies said.Early in the morning he frequented the public walks, the gymnasia for bodily training, and the school where youths were receiving instruction; he was to be seen at the market-place at the hour when it was most crowded, among the booths and tables where goods were exposed for sale. His whole day was usually spent in this public manner. He talked with any one, young or old, rich or poor, who sought toaddress him, and in the hearing of all who stood by. As it was engaging, curious, and instructive to hear, certain persons made it their habit to attend him in public as companions and listeners.
Another peculiarity of Socrates was his persuasion of a special religious mission, of which he believed that he had received oracular intimation. About the time when he began to have repute as a wiseman, an admirer and friend, Chaerephon, consulted the oracle at Delphi, as to whether any man was wiser than Socrates. The priestess replied "none." The answer, he said, perplexed him very much; for he was conscious to himself that he possessed no wisdom, on any subject, great or small. At length he resolved to put the matter to the test, by taking measure of the wisdom of other persons as comparedwith his own. Sleeting a leading politician, accounted wise by himself and others, he put a series of questions to him, and found his supposed wisdom was no wisdom at all. He next tried to demonstrate to the politician himself how much he was deficient; but he refused to be convinced. He then saw a meaning in the oracle, to the effect that his superiority to others lay not in his wisdom, but inhis being fully conscious of his ignorance. He tried the same experiment on other politicians, then on poets, and lastly on artists and artisans, and with the same result. Thereupon, he considered it as a duty imposed on him by the Delphian god, to cross-question men of all degrees, as to their knowledge, to make them conscious of their ignorance, and so put them in the way of becoming wise.According to Xenophon, he would pass from his severe cross-questioning method, and address to his hearers plain and homely precepts, inculcating self-control, temperance, piety, duty to parents, brotherly love, fidehty in friendship, diligelice, etc.

Aristotle
Aristotle was born around 384 BC in Stagirus on the Chalcidic peninsula of northern Greece, to Nicomachus, a medical doctor, and Phaestis.Stagirus was his father's home, while Phaestis came from Chalcis in Euboea.
We don't know anything about Aristotle's childhood, but it is likely Nicomachus would have expected his son to follow in his footsteps. So, Aristotle quite probably traveled with his father on his work, which was the way of the physician of the day. Unhappy with the conditions in the region, Nicomachus began traveling and...