Metaphor of The Sun
For more details on this topic, see Plato's metaphor of the sun.In The Republic (507b-509c) Plato's Socrates uses the sun as a metaphor for the source of "intellectual illumination," which he held to be The Form of the Good. The metaphor is about the nature of ultimate reality and how we come to know it. It starts with the eye, which Socrates says is unusual among the sense organs in that it needs a medium, namely light, in order to operate. The strongest and best source of light is the sun; with it, we can discern objects clearly. Analogously for intelligible objects The Form of the Good is necessary in order to understand any particular thing. Thus, if we attempt to understand why things are as they are, and what general categories can be used to understand various particulars around us, without reference to any forms (universals) we will fail completely. By contrast, "the domain where truth and reality shine resplendent" is none other than Plato's world of forms—illuminated by the highest of the forms, that of the Good.
Read more about this topic: Platonic Epistemology
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