J. F. Marmontel, Lucile, sc. 4 (opéra comique in 1 Act, Music by Grétry, 1769). It goes on: Tout est content, le cœur, les yeux, / Vivons, aimons comme nos aieux! Reported in W. F. H. King (ed.) Classical and Foreign Quotations, 3rd ed. (1904), p. 254, no. 2001https://en.wikiquote.org/wiki/Family