What did Jean Le Rond d’Alembert argue in Essai sur les gens de lettres?

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In his Essai sur les gens de lettres, published within his 1753 collection MĂ©langes de littĂ©rature, d’histoire et de philosophie, Jean Le Rond d’Alembert advocated for the intellectual integrity of writers. He exhorted authors to pursue "liberty, truth and poverty" and urged aristocratic patrons to respect the talents and independence of those writers.1