Letters from a Stoic by Seneca [40 to 52] | Audiobook with Text 

"Therefore, mark my words; that forceful manner of speech, rapid and copious, is more suited to a mountebank than to a man who is discussing and teaching an important and serious subject. But I object just as strongly that he should drip out his words as that he should go at top speed; he should neither keep the ear on the stretch, nor deafen it." - Letter 40, Letters from a Stoic by Seneca