"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."
"Those who live by mystery & charlatanerie, fearing you would render them useless by simplifying the Christian philosophy - the most sublime and benevolent, but most perverted system that ever shone on man - endeavored to crush your well-earned & well-deserved fame."
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Source: Letter to Dr. Joseph Priestley, March 21, 1801.
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