“Persuasion hung upon his lips, and the elements of Logick and Rhetorick were so blended up in him, — and, withall, he had so shrewd guess at the weaknesses and passions of his respondent, — that NATURE might have stood up and said, — "This man is eloquent."”
Book I, Ch. 19.
The Life and Opinions of Tristram Shandy, Gentleman (1760-1767)
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Laurence Sterne 50
Irish/English writer 1713–1768Related quotes

Les passions sont les seuls orateurs qui persuadent toujours. Elles sont comme un art de la nature dont les règles sont infaillibles; et l'homme le plus simple qui a de la passion persuade mieux que le plus éloquent qui n'en a point.
Variant translation: The passions are the only orators who always persuade. They are like a natural art, of which the rules are unfailing; and the simplest man who has passion will be more persuasive than the most eloquent man who has none.
Maxim 8.
Reflections; or Sentences and Moral Maxims (1665–1678)
From Here to Eternity (1951)

On Kippis; Gregory’s Life of Hall, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

The Decline and Fall of Practically Everybody (1950), Part II: Ancient Greeks and Worse, Hannibal