Letters 92.10

Man’s primary art is virtue itself; there is joined to this the useless and fleeting flesh, fitted only for the reception of food, as Posidonius remarks. This divine virtue ends in foulness, and to the higher parts, which are worshipful and heavenly, there is fastened a sluggish and flabby animal. As for the second desideratum,—quiet,—although it would indeed not of itself be of any benefit to the soul, yet it would relieve the soul of hindrances; pleasure, on the contrary, actually destroys the soul and softens all its vigour. What elements so inharmonious as these can be found united? To that which is most vigorous is joined that which is most sluggish, to that which is austere that which is far from serious, to that which is most holy that which is unrestrained even to the point of impurity.

Seneca, Letters to Lucilius 92.10, translated by Richard Mott Gummere