"My father!" cried Tom, off his guard for the moment. "I trow he cannot speak his own so that any but the swine that kennel in the styes may tell his meaning; and as for learning of any sort soever—"
He looked up and encountered a solemn warning in my Lord St. John's eyes.
He stopped, blushed, then continued low and sadly: "Ah, my malady persecuteth me again, and my mind wandereth. I meant the King's grace no irreverence."

Ch. 6: 'Tom receives instructions.' - The Prince and the Pauper (1881)