Miguel de Cervantes,
Don Quixote — Volume 2, Chapter LXVIII
(1885)
“ Don Quixote's cares kept him restless, so much so that he awoke Sancho and said to him, "I am amazed, Sancho, at the unconcern of thy temperament. I believe thou art made of marble or hard brass, incapable of any emotion or feeling whatever. I lie awake while thou sleepest, I weep while thou singest, I am faint with fasting while thou art sluggish and torpid from pure repletion. It is the duty of good servants to share the sufferings and feel the sorrows of their masters, if it be only for the sake of appearances. ”
