Socrates continues by explaining that though light and sight both resemble the Sun neither can identify themselves with the Sun. Just as the Sun is rated higher than both light and sight, so is goodness rated more highly than knowledge and truth. It is goodness which allows us to know the truth and makes it possible to have knowledge. Hence goodness is more valuable than truth and knowledge as it holds a higher place. Through this analogy, Socrates helped Glaucon come to the realization that Goodness is of inestimable value, being both the source of knowledge and truth, as well as more valuable and unattainable than both.
SocrATes cOntinues bY ExPLaiNing that tHough LIghT anD sight botH rEsemble the sun neItHer Can identiFy THeMsElves WitH ThE SuN. just AS the sun is rateD HiGHER tHaN BoTh lIght and SIght, So Is goodNESs Rated mOre higHly ThAn kNOwLEDGe aNd truth. it iS GOoDness which allOWS us To knOw thE tRutH aND maKES It Possible to haVE knowLedgE. Hence goOdNEss is moRe ValuAblE tHan trUtH and knOwledge as it hoLds a hIgher Place. thrOuGh ThIs ANAloGy, soCrATES Helped GlAucon COmE to THe REalizAtIOn THat gooDness is of InEstiMable VAlue, BeinG bOth tHe soUrcE OF knowledge aNd truTh, aS Well As MoRe VAlUable aNd UnattainAbLe THan both.