Letters 114.25

But when the disease has gradually eaten away the strength, and luxurious habits have penetrated the marrow and the sinews, such a soul exults at the sight of limbs which, through its overindulgence, it has made useless; instead of its own pleasures, it views those of others; it becomes the go-between and witness of the passions which, as the result of self-gratification, it can no longer feel. Abundance of delights is not so pleasing a thing to that soul as it is bitter, because it cannot send all the dainties of yore down through the over-worked throat and stomach, because it can no longer whirl in the maze of eunuchs and mistresses, and it is melancholy because a great part of its happiness is shut off, through the limitations of the body.

Seneca, Letters to Lucilius 114.25, translated by Richard Mott Gummere