Letters 27.8

This same Satellius began to advise Sabinus to take wrestling lessons,—sickly, pale, and thin as he was, Sabinus answered: “How can I? I can scarcely stay alive now.” “Don’t say that, I implore you,” replied the other, “consider how many perfectly healthy slaves you have!” No man is able to borrow or buy a sound mind; in fact, as it seems to me, even though sound minds were for sale, they would not find buyers. Depraved minds, however, are bought and sold every day.

Seneca, Letters to Lucilius 27.8, translated by Richard Mott Gummere