committed his teaching to writing because the kind of interplay 
of minds that is in teaching is not possible by means of 
writing. (3)

Does the interiorization of media such as letters alter the ratio 
among our senses and change mental processes?

*     What concerned Cicero, the practical Roman, was that the 
Greeks had put difficulties in the way of his own program for 
the doctus orator.  In chapters xv­xxiii of the third book of the 
De oratore,  he offers a history of philosophy from the beginning 
to his own time, trying to explain how it came about that the 
professional philosophers had made a breach between 
eloquence and wisdom, between practical knowledge and 
knowledge which these men professed to follow for its own 
sake. Before Socrates, learning had been the preceptress of