Socrates: The disgrace begins when a man writes not well, but badly.
Phaedrus: Clearly.
Socrates: And what is well and what is badly—need we ask Lysias, or any other poet or orator, who ever wrote or will write either a political or any other work, in metre or out of metre, poet or prose writer, to teach us this?

258d (tr. Benjamin Jowett) - Phaedrus