Moral Letters to Lucilius Section 14

Quattuor hae naturae sunt, arboris, animalis, hominis, dei; haec duo, quae rationalia, sunt, eandem naturam habent, illo diversa sunt, quod alterum inmortale, alterum mortale est. Ex his ergo unius bonum natura perficit, dei scilicet, alterius cura, hominis. Cetera tantum in sua natura perfecta sunt, non vere perfecta, a quibus abest ratio. Hoc enim demum perfectum est, quod secundum universam naturam perfectum, universa autem natura rationalis est. Cetera possunt in suo genere esse perfecta.

Il y a quatre espèces de natures : celle de l’arbre, celle de la brute, celle de l’homme et celle de Dieu. L’homme et Dieu, étant raisonnables, ont la même nature : ils ne différent qu’en ce que l’un ne meurt pas, et que l’autre est mortel : la nature de l’un constitue son bonheur ; l’autre doit conquérir le sien. Les autres natures sont parfaites dans leur genre, non d’une vraie perfection : car la raison leur est étrangère. Il n’y a de vraiment parfait que ce qui l’est d’après les lois universelles de la nature : or, cette nature est raisonnable ; mais des créatures inférieures peuvent avoir une perfection relative.

There are four natures which we should mention here: of the tree, animal, man, and God. The last two, having reasoning power, are of the same nature, distinct only by virtue of the immortality of the one and the mortality of the other. Of one of these, then - to wit God - it is Nature that perfects the Good; of the other - to wit man - pains and study do so. All other things are perfect only in their particular nature, and not truly perfect, since they lack reason. Indeed, to sum up, that alone is perfect which is perfect according to nature as a whole, and nature as a whole is possessed of reason. Other things can be perfect according to their kind.