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In The Republic, Plato introduces a philosophy that governs the exclusivity of this contemplative and the active lives. He defines the best truth as "aletheia", which leads to mean "unhidden" or "that which doesn't stay unnoticed". During his use of the term and his allegory of the cave, Plato makes the strong implication that philosophers must actively attempt to find the reality, instead of relying on conventional methods of contemplation and the persuasive tone of rhetoric to prove its existence. To better explain his rationale, Plato constructs a descent involving the sun and the greatest good. He argues that "the soul is similar to the eye" as it requires an outside force to establish clarity of vision (Book VI p. 25). If the ultimate great illuminates an idea with reason and truth such as the sun illuminates an object, the soul knows with clarity. When an idea isn't illuminated, the spirit perceives nothing obviously and retreats to the ignorance of a unenlightened opinion. Plato extends this metaphor through his writings and succeeds in about the complexity of the intellectual universe to the tangibility and familiarity of this visible world. In this way, Plato permits to get a comprehensive comprehension and, from simply suggesting his stance using figurative speech and dialectic, he motivates Glaucon and also the reader to come to their own realizations of the ultimate good, thereby achieving "aletheia". Plato introduces the importance of light and sight by assessing the commonalities of their physical realm with the ideals of his high, philosophical kingdom. Through a series of linear queries, he comes to the conclusion which the sun is "to the visible world in connection with sight" as "good i.. .