"When I was fourteen, my father was so ignorant I could hardly stand to have him around. When I got to be twenty-one, I was astonished at how much he had learned in seven years. See what happens when you "know it all", at any stage of life? Farther down the track you may see clearly how certain personal opinions, held onto too tightly, could be fogging up the view, and providing incorrect insight. Prosperity is the best protector of principle."

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I am aware that I am very old now; but I am also aware that I have never been so young as I am now, in spirit, since I was fourteen and entertained Jim Wolf with the wasps. I am only able to perceive that I am old by a mental process; I am altogether unable to feel old in spirit. It is a pity, too, for my lapses from gravity must surely often be a reproach to me. When I am in the company of very young people I always feel that I am one of them, and they probably privately resent it.

— Mark Twain