De Beneficiis and the series regarding "the happy life" translate to what Greek concept?
De Beneficiis:  It forms part of a series of moral essays (or "Dialogues") composed by Seneca, whose other philosophical explorations included providence, steadfastness, the happy life, anger, leisure, tranquility, the brevity of life, gift-giving, forgiveness, and treatises on natural phenomena.
i don't know