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The Theory of Forms or Theory of Ideas, [1] [2] [3] also known as Platonic idealism or Platonic realism, is a philosophical theory widely credited to the Classical Greek philosopher Plato. A major concept in metaphysics , the theory suggests that the physical world is not as real or true as Forms.
There were three periods: the Old, Middle, and New Academy. The chief figures in the Old Academy were Speusippus (Plato's nephew), who succeeded him as the head of the school (until 339 BC), and Xenocrates (until 313 BC). Both of them sought to fuse Pythagorean speculations on number with Plato's theory of forms.
Plato's most self-critical dialogue is the Parmenides, which features Parmenides and his student Zeno, which criticizes Plato's own metaphysical theories. Plato's Sophist dialogue includes an Eleatic stranger. These ideas about change and permanence, or becoming and Being, influenced Plato in formulating his theory of Forms. [54]
Plato's theory of the soul, which was inspired variously by the teachings of Socrates, considered the psyche (Ancient Greek: ψῡχή, romanized: psūkhḗ) to be the essence of a person, being that which decides how people behave. Plato considered this essence to be an incorporeal, eternal occupant of a person's being.
27. “Ignorance, the root and stem of all evil.” 28. “Be kind, for everyone you meet is fighting a harder battle.” 29. “For a man to conquer himself is the first and noblest of all ...
Plato's allegory of the cave by Jan Saenredam, according to Cornelis van Haarlem, 1604, Albertina, Vienna. Plato's allegory of the cave is an allegory presented by the Greek philosopher Plato in his work Republic (514a–520a, Book VII) to compare "the effect of education (παιδεία) and the lack of it on our nature".
Plato uses this observation to illustrate his famous doctrine that the soul is a self-mover: life is self-motion, and the soul brings life to a body by moving it. Meanwhile, in the recollection and affinity arguments, the connection with life is not explicated or used at all.
In philosophy, Plato's epistemology is a theory of knowledge developed by the Greek philosopher Plato and his followers.. Platonic epistemology holds that knowledge of Platonic Ideas is innate, so that learning is the development of ideas buried deep in the soul, often under the midwife-like guidance of an interrogator.