Marshall McLuhan & The Discovery Of The Alphabet

The discovery of the alphabet will create forgetfulness in the learners' souls, because they will not use their memories: they will trust to the external written characters and not remember of themselves ... You give your disciples not truth but only the semblance of truth: they will be heroes of many things, and will have learned nothing; they will appear to be omniscient and will generally know nothing

- Socrates, "Phaedrus"

Let me Google that for you...