Gratitude is not only the greatest of virtues, but the paren't of all the others.

© Cicero

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Cicero - Wikipedia
1st-century BC Roman philosopher and statesman Marcus Tullius Cicero[n 1] (; Classical Latin: [ˈmaːr.kʊs ˈtʊl.lɪ.ʊs ˈkɪ.kɛ.roː]; 3 January 106 BC – 7 December 43 BC) was a Roman statesman, orator, ...