"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 hold it certain that to open the doors of truth and to fortify the habit of testing everything by reason are the most effectual manacles we can rivet on the hands of our successors to prevent their manacling the people with their own consent."
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Source: Thomas Jefferson, Joyce Appleby, Terence Ball (1999). “Jefferson: Political Writings”, p.271, Cambridge University Press
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