Moral Letters to Lucilius Section 8

Inrationalis pars animi duas habet partes, alteram animosam, ambitiosam, inpotentem, positam in adfectionibus, alteram humilem, languidam, voluptatibus deditam; illam effrenatam, meliorem tamen, certe fortiorem ac digniorem viro reliquerunt, hanc necessariam beatae vitae putaverunt, enervem et abiectam.

La partie irraisonnable de l’âme se divise en deux autres : la première, ardente, ambitieuse, violente, tout entière aux passions ; la seconde, basse, languissante, que la volupté asservit. La partie effrénée, meilleure toutefois que l’autre, et certes plus courageuse et plus digne de l’homme, on n’en a pas tenu compte ; on a cru indispensable au bonheur la partie débile et abjecte. On a voulu lui assujettir la raison ;

The irrational part of the soul is twofold: the one part is spirited, ambitious, uncontrolled; its seat is in the passions; the other is lowly, sluggish, and devoted to pleasure. Philosophers have neglected the former, which, though unbridled, is yet better, and is certainly more courageous and more worthy of a man, and have regarded the latter, which is nerveless and ignoble, as indispensable to the happy life.