"A teacher affects eternity; he can never tell where his influence stops."
"A period of about twelve years measured the beat of the pendulum. After the Declaration of Independence, twelve years had been needed to create an efficient Constitution; another twelve years of energy brought a reaction against the government then created; a third period of twelve years was ending in a sweep toward still greater energy; and already a child could calculate the result of a few more such returns."
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Source: Henry Adams (2011). “History of the United States of America -”, p.123, Cambridge University Press
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