Virtue extends our days: he lives two lives who relives his past with pleasure.
Ampliat aetatis spatium sibi vir bonus. Hoc est
Vivere bis vita posse priore frui.
Vivere bis vita posse priore frui.
Original text (Latin)
Source, in full
X, 23. Alternatively translated as "The good man prolongs his life; to be able to enjoy one's past life is to live twice", in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "For he lives twice who can at once employ / The present well, and e'en the past enjoy", Alexander Pope, Imitation of Martial.