Presumption should never make us neglect that which appears easy to us, nor despair make us lose courage at the sight of difficulties.
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Source, in full
This appeared in Banneker's Almanac in 1794, and is commonly attributed to him, but originates earlier in "Reflections on different Subjects of Morality, by Stanisław Leszczyński, King of Poland, Duke of Lorrain and Bar" in The Universal Magazine (1765), p. 119