Mark Twain's father

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Mark Twain wrote:

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.

I wonder if it's true: Where parents or friends try to instill what is based on experience, there is a chance for a good result. But where they try to instill what is based on belief, calamity is bound to follow.
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