Charles Dickens - Barnaby Rudge

It was remarkable that although he had that dim sense of the past, he sought out Hugh's dog, and took him under his care; and that he never could be tempted into London. When the Riots were many years old, and Edward and his wife came back to England with a family almost as numerous as Dolly's, and one day appeared at the Maypole porch, he knew them instantly, and wept and leaped for joy. But neither to visit them, nor on any other pretence, no matter how full of promise and enjoyment, could he be persuaded to set foot in the streets: nor did he ever conquer this repugnance or look upon the town again.

Grip soon recovered his looks, and became as glossy and sleek as ever. But he was profoundly silent. Whether he had forgotten the art of Polite Conversation in Newgate, or had made a vow in those troubled times to forego, for a period, the display of his accomplishments, is matter of uncertainty; but certain it is that for a whole year he never indulged in any other sound than a grave, decorous croak. At the expiration of that term, the morning being very bright and sunny, he was heard to address himself to the horses in the stable, upon the subject of the Kettle, so often mentioned in these pages; and before the witness who overheard him could run into the house with the intelligence, and add to it upon his solemn affirmation the statement that he had heard him laugh, the bird himself advanced with fantastic steps to the very door of the bar, and there cried, 'I'm a devil, I'm a devil, I'm a devil!' with extraordinary rapture.

From that period (although he was supposed to be much affected by the death of Mr Willet senior), he constantly practised and improved himself in the vulgar tongue; and, as he was a mere infant for a raven when Barnaby was grey, he has very probably gone on talking to the present time.