Letters 85.23

Satiety, I think, is the limit to our eating or drinking. A eats more and B eats less; what difference does it make? Each is now sated. Or A drinks more and B drinks less; what difference does it make? Each is no longer thirsty. Again, A lives for many years and B for fewer; no matter, if only A’s many years have brought as much happiness as B’s few years. He whom you maintain to be “less happy” is not happy; the word admits of no diminution.

Seneca, Letters to Lucilius 85.23, translated by Richard Mott Gummere