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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.
For Plato, the soul moves things by means of its thoughts, as one scholar puts it, and accordingly, the soul is both a mover (i.e., the principle of life, where life is conceived of as self-motion) and a thinker.
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.
The Form of the Good, or more literally translated "the Idea of the Good" (ἡ τοῦ ἀγαθοῦ ἰδέα [a]), is a concept in the philosophy of Plato.In Plato's Theory of Forms, in which Forms are defined as perfect, eternal, and changeless concepts existing outside space and time, the Form of the Good is the mysterious highest Form and the source of all the other Forms.
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 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.
The dictum is recorded in Plato's Apology (38a5–6) as ὁ δὲ ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ (ho dè anexétastos bíos ou biōtòs anthrṓpōi, literally "but the unexamined life is not lived by man").