"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."
"this interesting subject, which, if the condition of man is to be progressively ameliorated, as we fondly hope and believe, is to be the chief instrument in effecting it."
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Source: Thomas Jefferson (1861). “Correspondence. Reports and opinions while secretarry of state”, p.106
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