Profpar, somehow I completely missed your post... Anyway, I only remember it because a few years ago I saw Hal Holbrook as Mark Twain. It was as hilarious as it was amazing at how well Holbrook captured the "meaning" of Twain's words and brought them to life. As it stands, my post wasn't the absolute correct quote so as to fix it...
Mark Twain once said:
“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 by how much he'd learned in seven years.”
-Jason