"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."
"As you are entered with the class of Nat. philosophy, give to it the hours of lecture, but devote all your other time to Mathematics, avoiding company as the bane of all progress."
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Source: Thomas Jefferson, J. Jefferson Looney (2004). “The Papers of Thomas Jefferson, Retirement Series, Volume 2: 16 November 1809 to 11 August 1810”, p.110, Princeton University Press
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