Footnote quotation from the Loeb edition of Seneca's Letters

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"Q. Sextus was a Stoic with Pythagorean leangings, who lived in the days of Julius Caesar. He is also mentioned in Epp. lxiv. and lxxiii. A book of moral Sententiae, taken over by the Church, is assigned to him, perhaps wrongly" (Seneca, Ad Lucilium Epistulae Morales. Trans. Richard M. Gummere, vol. I. pg. 412)