“We can never add more truth to what is true already, nor make that true which is false.”

— Bernard Le Bovier de Fontenelle

p, 125
The History of Oracles, and the Cheats of the Pagan Priests (1688)

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Bernard Le Bovier de Fontenelle 13

French writer, satirist and philosopher of enlightenment 1657–1757

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“Already I had learned from thee that because a thing is eloquently expressed it should not be taken to be as necessarily true; nor because it is uttered with stammering lips should it be supposed false. Nor, again, is it necessarily true because rudely uttered, nor untrue because the language is brilliant.”

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Variation on the middle sentence: A thing is not necessarily true because badly uttered, nor false because spoken magnificently.
Variation on the middle sentence: A thing is not necessarily false because it is badly expressed, nor true because it is expressed magnificently.
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Context: Already I had learned from thee that because a thing is eloquently expressed it should not be taken to be as necessarily true; nor because it is uttered with stammering lips should it be supposed false. Nor, again, is it necessarily true because rudely uttered, nor untrue because the language is brilliant. Wisdom and folly both are like meats that are wholesome and unwholesome, and courtly or simple words are like town-made or rustic vessels — both kinds of food may be served in either kind of dish.