And now look again, and see what will naturally follow if the prisoners are released and disabused of their error. At first, when any of them is liberated and compelled suddenly to stand up and turn his neck round and walk and look toward the light, he will suffer sharp pains; the glare will distress him, and he will be unable to see the realities of which in his former state he had seen the shadows; and then conceive someone saying to him, that what he saw before was an illusion, but that now, when he is approaching nearer to being and his eye is turned toward more real existence, he has a clearer vision - what will be his reply? And you may further imagine that his instructor is pointing to the objects as they pass and requiring him to name them - will he not be perplexed? Will he not fancy that the shadows which he formerly saw are truer than the objects which are now shown to him?
And if he is compelled to look straight at the light, will he not have a pain in his eyes which will make him turn away to take refuge in the objects of vision which he can see, and which he will conceive to be in reality clearer than the things which are now being shown to him?
True, he said. (360-1)
Plato. The Republic. Trans. Benjamin Jowett. Dover Publications 2007.
Works and Days