Seneca,
Moral letters to Lucilius — Letter 27…
“ Sabinus remarked that each slave cost him one hundred thousand sesterces; Satellius replied: "You might have bought as many book-cases for a smaller sum." But Sabinus held to the opinion that what any member of his household knew, he himself knew also. 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 ”
