"Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude."
"Morals were too essential to the happiness of man, to be risked on the uncertain combinations of the head. Nature laid their foundation, therefore, in sentiment, not in science."
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Source: Thomas Jefferson (1829). “Memoirs, Correspondence, and Private Papers of Thomas Jefferson: Late President of the United States”, p.53
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