These works blend ethics, political philosophy, moral psychology, epistemology, and metaphysics into an interconnected and systematic philosophy.It is most of all from Plato that we get the theory of Forms, according to which the world we know through the senses is only an imitation of the pure, eternal, and unchanging world of the Forms. Plato came from one of the wealthiest and most politically active families in Athens.Later (at 3.6), Diogenes says that Plato was twenty-eight when Socrates was put to death (in 399), which would, again, put his year of birth at 427. Both sides of the family claimed to trace their ancestry back to Poseidon (D. We can be confident that Plato also had two older brothers, Glaucon and Adeimantus, and a sister, Potone, by the same parents (see D. "Plato" seems to have started as a nickname (for or "broad"), perhaps first given to him by his wrestling teacher for his physique, or for the breadth of his style, or even the breadth of his forehead (all given in D. Plato occasionally mentions Egypt in his works, but not in ways that reveal much of any consequence (see, for examples, According to the account given there, Plato first went to Italy and Sicily when he was "about forty" (324a). (This is where we get our word, "academic." The Academy got its name from its location, a grove of trees sacred to the hero Academus—or Hecademus [see D. 3.7]—a mile or so outside the Athenian walls; the site can still be visited in modern Athens, but visitors will find it depressingly void of interesting monuments or features.) Except for two more trips to Sicily, the Academy seems to have been Plato's home base for the remainder of his life.In spite of the confusion, the dates of Plato's life we gave above, which are based upon Eratosthenes' calculations, have traditionally been accepted as accurate. According to Diogenes, whose testimony is notoriously unreliable, Plato's parents were Ariston and Perictione (or Potone—see D. While he stayed in Syracuse, he became the instructor to Dion, brother-in-law of the tyrant Dionysius I. The first of Plato's remaining two Sicilian adventures came after Dionysius I died and his young son, Dionysius II, ascended to the throne. Dionysius then summoned Plato, but wished for Dion to wait a while longer.Plato, perhaps now completely disgusted with politics, returned to his beloved Academy, where he lived out the last thirteen years of his life. His grave, however, has not yet been discovered by archeological investigations. There can be no doubt that Plato was also strongly influenced by Parmenides and Zeno (both of Elea), in Plato's theory of the Forms, which are plainly intended to satisfy the Parmenidean requirement of metaphysical unity and stability in knowable reality.According to Diogenes, Plato was buried at the school he founded (D. Aristotle and Diogenes agree that Plato had some early association with either the philosophy of Heraclitus of Ephesus, or with one or more of that philosopher's followers (see Aristotle Metaph. Parmenides and Zeno also appear as characters in his dialogue, the He mixed together in his works the arguments of Heracleitus, the Pythagoreans, and Socrates. 3.8) A little later, Diogenes makes a series of comparisons intended to show how much Plato owed to the comic poet, Epicharmus (3.9-3.17). Though influenced primarily by Socrates, to the extent that Socrates is usually the main character in many of Plato's writings, he was also influenced by Heraclitus, Parmenides, and the Pythagoreans.Plato's middle to later works, including his most famous work, the , are generally regarded as providing Plato's own philosophy, where the main character in effect speaks for Plato himself.
We also are introduced to the ideal of "Platonic love:" Plato saw love as motivated by a longing for the highest Form of beauty—The Beautiful Itself, and love as the motivational power through which the highest of achievements are possible. One of Plato's uncles (Charmides) was a member of the notorious "Thirty Tyrants," who overthrew the Athenian democracy in 404 B. Plato's relatives were not exclusively associated with the oligarchic faction in Athens, however.Regarding the sensibles, he borrows from Heraclitus; regarding the intelligibles, from Pythagoras; and regarding politics, from Socrates. Diogenes Laertius (3.6) claims that Plato visited several Pythagoreans in Southern Italy (one of whom, Theodorus, is also mentioned as a friend to Socrates in Plato's Plato has Echecrates, another Pythagorean, in the group around Socrates on his final day in prison.Plato's Pythagorean influences seem especially evident in his fascination with mathematics, and in some of his political ideals (see Plato's political philosophy), expressed in various ways in several dialogues.Kant denies that either space or time are substance, entities in themselves, or learned by experience; he holds, rather, that both are elements of a systematic framework we use to structure our experience.Mc Taggart in The Unreality of Time, have argued that time is an illusion (see also The flow of time, below).