A minor point at the end of Plato's dialogue Phaedrus. Socrates relates the story of the Egyptian god Theuth (or Thoth) delivering writing to Thamus, King of Egypt. Thamus responds: 


For this invention will produce forgetfulness in the minds of those who learn to use it, because they will not practice their memory. Their trust in writing, produced by external characters which are no part of themselves, will discourage the use of their own memory within them. You have invented an elixir not of memory, but of reminding; and you offer your pupils the appearance of wisdom, not true wisdom, for they will read many things without instruction and will therefore seem to know many things, when they are for the most part ignorant and hard to get along with, since they are not wise, but only appear wise.

- trans. Fowler.

Socrates recommends dialectics instead.

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