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Moral Letters to Lucilius [Epistulae morales ad Lucilium], letter 2 "On Discursiveness in Reading," sec. 6 - Seneca the Younger | WIST Quotations
The poor one is not the man who has little, but the man who craves more. [Non qui parum habet, sed qui plus cupit, pauper est.] Alt trans. (Gummere (1918)): "It is not the man who has too little, but the man who craves more, that is poor."