"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."
"I am myself an empiric in natural philosophy, suffering my faith to go no further than my facts. I am pleased, however, to see the efforts of hypothetical speculation, because by the collisions of different hypotheses, truth may be elicited and science advanced in the end."
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Source: Thomas Jefferson, Henry Augustine Washington (1854). “The Writings of Thomas Jefferson: Correspondence, cont”, p.260
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