“When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much he had learned in seven years.”
— Attributed to Mark Twain (but probably not actually by him).
And if you like Groucho, then there’s this classic:
“Outside of a dog, a book is a man’s best friend. Inside of a dog, it’s too dark to read.”
The Wolf