Oratory skills

Cicero one of marquee orators believed that appealing to emotions of audience is far more effective than logic and scientific reasoning.

As per Plutarch, Demosthenes had "an inarticulate and stammering pronunciation" that he overcame by speaking with pebbles in his mouth and by repeating verses when running or out of breath. He also practiced speaking in front of a large mirror

Adlai Stevenson said

"Do you remember that in classical times when Cicrero had finished speaking, the people said, 'how well he spoke' - but when Demosthenes had finished speaking, the people said, 'Lets march'?"